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DIG v. GPS: Are Gas-Piston ARs Worth Their Premium Prices?

New AR-15 shooters-and there are hundreds of thousands of them in the last five years-face a bewildering set of choices when they consider buying a new rifle. Chambering (whats the difference between 223 Rem. and 5.56 NATO, and can the rounds be shot interchangeably?), features (rails, grips, handles, sights), and even color (basic black, sand, olive drab, or multiple color tones) are among the decisions the new buyer must ponder. And, of course, theres price, and now, gas mechanisms. The appearance of gas-piston systems in ARs has been variously hailed as a game-changer and as nothing special. Gun Tests readers have been asking for tests of gas-piston system (GPS) guns, and we are nearing the completion of head-to-head tests of several of those guns. But is standard AR direct-impingement-gas (DIG) operation going by the wayside?Perhaps, but we dont think so. There are many very good guns that work with the proven DIG system, and if GPS does supplant DIG, that sea change will be many years coming. But as for today, we wanted to find out if a GPS gun was worth hundreds of dollars more than two cheaper DIG guns at various price points. Our contestants were the High Standard HSA-15 Flat-Top Carbine No. HSTX6551, which lists for $920 and carries the dual-caliber designation of 5.56 NATO / 223 Rem. It is a direct-impingement unit like the Stag Arms Model 2T 5.56x45mm NATO, $1125. Pitted against these two traditional mechanisms is Rugers new SR-556FB 5.56x45mm NATO-223 Rem., a gas-piston gun that has an MSRP of $1995, but which commonly sells for around $1700. Thats a $575 premium above the Stag and a whopping $780 jump above the High Standard. But to see if those numbers reflect true value or simply fewer useful features, we had to get down in the weeds and shoot the guns side by side and see what we liked and what we didnt. But first, lets look at how the guns differ internally.

DIG v. GPS: Are Gas-Piston ARs Worth Their Premium Prices?

New AR-15 shooters-and there are hundreds of thousands of them in the last five years-face a bewildering set of choices when they consider buying a new rifle. Chambering (whats the difference between 223 Rem. and 5.56 NATO, and can the rounds be shot interchangeably?), features (rails, grips, handles, sights), and even color (basic black, sand, olive drab, or multiple color tones) are among the decisions the new buyer must ponder. And, of course, theres price, and now, gas mechanisms. The appearance of gas-piston systems in ARs has been variously hailed as a game-changer and as nothing special. Gun Tests readers have been asking for tests of gas-piston system (GPS) guns, and we are nearing the completion of head-to-head tests of several of those guns. But is standard AR direct-impingement-gas (DIG) operation going by the wayside?Perhaps, but we dont think so. There are many very good guns that work with the proven DIG system, and if GPS does supplant DIG, that sea change will be many years coming. But as for today, we wanted to find out if a GPS gun was worth hundreds of dollars more than two cheaper DIG guns at various price points. Our contestants were the High Standard HSA-15 Flat-Top Carbine No. HSTX6551, which lists for $920 and carries the dual-caliber designation of 5.56 NATO / 223 Rem. It is a direct-impingement unit like the Stag Arms Model 2T 5.56x45mm NATO, $1125. Pitted against these two traditional mechanisms is Rugers new SR-556FB 5.56x45mm NATO-223 Rem., a gas-piston gun that has an MSRP of $1995, but which commonly sells for around $1700. Thats a $575 premium above the Stag and a whopping $780 jump above the High Standard. But to see if those numbers reflect true value or simply fewer useful features, we had to get down in the weeds and shoot the guns side by side and see what we liked and what we didnt. But first, lets look at how the guns differ internally.

Santa and His B&C Sleigh

Now this is funny. Santa and his Texas whitetail sleigh.

Four M1 Carbines: CMP, Fulton, And Auto-Ordnance Compete

The M1 carbine was the most prolific U.S. weapon of the WWII era, with six-odd million made, and it's still very popular today. It employs an anemic round by rifle standards, but—per its design—its cartridge is at least as powerful as most handgun rounds. Today's buyer of a genuine WWII-era or Korean War era carbine will probably need to spend around a thousand dollars, give or take a few hundred, for a reasonable example. On GunBroker we saw prices from about $750 to$1400, depending on condition and rarity. However, if you're qualified, and if you hurry, you may be able to get a decent carbine for about $420-675, through the Civilian Marksmanship Program (CMP) sales. This outlet used to be called the DCM, Director of Civilian Marksmanship, run by the U.S. government, but that program is now in private hands. However, due to the nature of the program, the CMP carbines may be in very short supply by the time this report appears in print.

Do you qualify for a CMP firearm purchase? Taking the CMP requirements straight from the website (www.thecmp.org), "By law, the CMP can sell surplus military firearms, ammunition, parts and other items only to members of CMP-affiliated clubs who are also U.S. citizens, over 18 years of age and… legally eligible to purchase a firearm." For more information, visit the website.

For this test we acquired four carbines. We had on hand a Fulton Armory carbine, with an original Underwood barrel in near-perfect condition. But if you want a Fulton-built M1 carbine today you'll have to get it with the new Fulton barrel ($1300). All of the original mil-spec barrels are apparently now gone. Two of our carbines came from the CMP, both "Service Grade." One was an Underwood (CMP-1, $565) and the other an Inland (CMP-2, $ 495). The so-called "Rack Grade" carbines are a bit less expensive. Finally, we acquired a new Auto-Ordnance AOM130 M1 Carbine ($899) with beautiful walnut stock and newly manufactured metalwork.

In our testing of these four M1 carbines, we found many similarities and a few differences. There were two types of safeties. One was the swinging-arm or "flip" type, which requires pulling a small lever rearward to put the gun into the firing position. This is easily accomplished with the right index finger, by right handers, and fairly easily by the trigger finger of lefties. The second safety type was the crossbolt, similar to that found on many pump shotguns. This required pressing to the left to fire, which we found could not be done as easily by lefties. The Auto-Ordnance and Underwood (CMP-1) carbines had the push-button safety. The Auto-Ord and Underwood also had the flat bolt, and neither of these two had a bayonet lug. All the guns except the Auto-Ord had the stepped, windage-adjustable rear sight. The A-O had a modern-made, two-height sight similar to the original M1 carbine sight, which had to be drifted for windage. The two CMP carbines had a stamped base for the adjustable rear sight. The Fulton had a milled base. The Underwood (CMP-1) had a sheet-metal trigger guard. All had the wing-protected front sight.

We tested with three types of 30 US Carbine FMJ "ball" ammunition, all of it 110-grain loads. It was from Sellier & Bellot, American Eagle, and original U.S. Mil-Spec ball (head stamped LC71). Because the two CMP carbines came without magazines, we used an original Winchester 15-round magazine for all our testing, with one exception explained below.

Generally speaking, here's what we think. Those who like shooting military type firearms really owe it to themselves to have an M1 carbine. They're a lot of fun. Good ones need not break the bank, but in an era where the SKS rifles that used to go begging at gun shows for $85 now bring upwards of $400, the price of an M1 carbine is not outlandish, even at the over-a-grand mark. We suggest you act soon, particularly if you want one from the CMP. They're going fast.

Details on the four guns we tested follow:

Four M1 Carbines: CMP, Fulton, And Auto-Ordnance Compete

The M1 carbine was the most prolific U.S. weapon of the WWII era, with six-odd million made, and it's still very popular today. It employs an anemic round by rifle standards, but—per its design—its cartridge is at least as powerful as most handgun rounds. Today's buyer of a genuine WWII-era or Korean War era carbine will probably need to spend around a thousand dollars, give or take a few hundred, for a reasonable example. On GunBroker we saw prices from about $750 to$1400, depending on condition and rarity. However, if you're qualified, and if you hurry, you may be able to get a decent carbine for about $420-675, through the Civilian Marksmanship Program (CMP) sales. This outlet used to be called the DCM, Director of Civilian Marksmanship, run by the U.S. government, but that program is now in private hands. However, due to the nature of the program, the CMP carbines may be in very short supply by the time this report appears in print.

Do you qualify for a CMP firearm purchase? Taking the CMP requirements straight from the website (www.thecmp.org), "By law, the CMP can sell surplus military firearms, ammunition, parts and other items only to members of CMP-affiliated clubs who are also U.S. citizens, over 18 years of age and… legally eligible to purchase a firearm." For more information, visit the website.

For this test we acquired four carbines. We had on hand a Fulton Armory carbine, with an original Underwood barrel in near-perfect condition. But if you want a Fulton-built M1 carbine today you'll have to get it with the new Fulton barrel ($1300). All of the original mil-spec barrels are apparently now gone. Two of our carbines came from the CMP, both "Service Grade." One was an Underwood (CMP-1, $565) and the other an Inland (CMP-2, $ 495). The so-called "Rack Grade" carbines are a bit less expensive. Finally, we acquired a new Auto-Ordnance AOM130 M1 Carbine ($899) with beautiful walnut stock and newly manufactured metalwork.

In our testing of these four M1 carbines, we found many similarities and a few differences. There were two types of safeties. One was the swinging-arm or "flip" type, which requires pulling a small lever rearward to put the gun into the firing position. This is easily accomplished with the right index finger, by right handers, and fairly easily by the trigger finger of lefties. The second safety type was the crossbolt, similar to that found on many pump shotguns. This required pressing to the left to fire, which we found could not be done as easily by lefties. The Auto-Ordnance and Underwood (CMP-1) carbines had the push-button safety. The Auto-Ord and Underwood also had the flat bolt, and neither of these two had a bayonet lug. All the guns except the Auto-Ord had the stepped, windage-adjustable rear sight. The A-O had a modern-made, two-height sight similar to the original M1 carbine sight, which had to be drifted for windage. The two CMP carbines had a stamped base for the adjustable rear sight. The Fulton had a milled base. The Underwood (CMP-1) had a sheet-metal trigger guard. All had the wing-protected front sight.

We tested with three types of 30 US Carbine FMJ "ball" ammunition, all of it 110-grain loads. It was from Sellier & Bellot, American Eagle, and original U.S. Mil-Spec ball (head stamped LC71). Because the two CMP carbines came without magazines, we used an original Winchester 15-round magazine for all our testing, with one exception explained below.

Generally speaking, here's what we think. Those who like shooting military type firearms really owe it to themselves to have an M1 carbine. They're a lot of fun. Good ones need not break the bank, but in an era where the SKS rifles that used to go begging at gun shows for $85 now bring upwards of $400, the price of an M1 carbine is not outlandish, even at the over-a-grand mark. We suggest you act soon, particularly if you want one from the CMP. They're going fast.

Details on the four guns we tested follow:

Best-In-Class Firearms 2009: Handguns, Rifles, and Shotguns

Every December I survey the work Ben Brooks, Roger Eckstine, Ray Ordorica, Joe Syczylo, Gene Taylor, Kevin Winkle, R.K. Campbell, and Ralph Winingham have done in Gun Tests, with an eye toward selecting guns the magazine’s testers have endorsed without qualification. From these evaluations I pick the best from a full year’s worth of tests and distill summary recommendations for readers, who often use them as year-end shopping guides. These 'best of' choices are a mixture of our original tests and other information I’ve compiled during the year. After the magazine’s FFLs sell high-rated test products to readers, I keep tabs on how many of those guns do over time, and if the firearms continue performing well, then I have confidence including them in this wrap-up.

Best-In-Class Firearms 2009: Handguns, Rifles, and Shotguns

Every December I survey the work Ben Brooks, Roger Eckstine, Ray Ordorica, Joe Syczylo, Gene Taylor, Kevin Winkle, R.K. Campbell, and Ralph Winingham have done in Gun Tests, with an eye toward selecting guns the magazine’s testers have endorsed without qualification. From these evaluations I pick the best from a full year’s worth of tests and distill summary recommendations for readers, who often use them as year-end shopping guides. These 'best of' choices are a mixture of our original tests and other information I’ve compiled during the year. After the magazine’s FFLs sell high-rated test products to readers, I keep tabs on how many of those guns do over time, and if the firearms continue performing well, then I have confidence including them in this wrap-up.

Ruger 77 Mark II 243 Heavy Barrel

This was an attractive $685 rifle, with a blonde-colored laminated stock sporting an extremely nice and well-done matte finish. After our initial negative experiences with the electronic Remington, the entirely conventional Ruger, with no gizz-whizzes or batteries or insulators needed to make it go bang, was most welcome. Besides .243, the same rifle is available in .223, .22-250, .220 Swift, 25-06 and .308.All the metalwork except the sling swivel studs was finished in a semi-matte light color that Ruger calls Target Gray, which we found very attractive in contrast with the light-colored stock. The studs were blued. The 26-inch-long stainless-steel barrel was free-floated evenly all the way back to the action.

James Debney Named President of S&W Firearms Business Unit

Smith & Wesson Holding Corporation announced that James Debney has been named as president of S&W’s Firearms Business unit, reporting to Michael Golden, president and CEO of Smith & Wesson Holding Corporation.

Sturm, Ruger wins 3rd Firearms Manufacturer of the Year Award

Sturm, Ruger & Company, Inc. has been presented with the Firearms Manufacturer of the Year award by the National Association of Sporting Goods Wholesalers for the third consecutive year.

Browning BL-22 Grade II Lever Action .22 LR

The Grade II is one of five BL-22s offered by Browning for 2008. The Grade II is scroll engraved on the receiver and has a gold-colored trigger. The Grade I tested in December 2006 lacks the II's scroll engraving and checkering on the walnut, but the Grade I MSRPs for a lot less, $494. Browning's most expensive lever rimfire is the BL-22 FLD Grade II Octagon, $786, which a silver-nitride finish, octagonal barrel, and a front gold bead. Because the Grade II comes at a $150-ish premium to the Marlin and Henry, we wondered if those extra dollars would turn into enthusiasm in our evaluation.

GunBroker.com Hosting Charity Auction of Pink Rifle to Fight Breast Cancer

In support of the fight against breast cancer, GunBroker.com is hosting a charity auction of an unusual pink rifle. The auction ends October 25.

DOJ Sues LA Sheriff for 2A Civil Rights Violations

Oh, man, this is so awesome. On September 30, 2025, the U.S. Department of Justice’s Civil Rights Division filed a lawsuit against the Los...