July 2009

Guncrafter Industries 50 GI Kit: Great Conversion for Glock 21

The big polymer Model 21 45 ACP from Glock didnít impress us all that much, but it did serve as an able platform for the easy-to-install 50-caliber Guncrafter slide and barrel.

Alex Zimmerman has a great idea. We first experienced it a while back in our review of one of his Guncrafter Industriesí 50-caliber 1911s, which we found to be a well-made handgun, if a bit on the costly side. Zimmermanís idea is to give the shooter something more without the cost of broken hands. Rather than a bang-up, hot and heavy blaster, the 50 GI is a throwback to older times when big bullets traveled at low velocities and got the job done at least as well as any small-caliber, high-velocity round. Some 200 years ago the norm was single-shot or occasional double flintlock pistols, which commonly threw balls of up to 12-bore in size at velocities in the low- to middle-hundreds of feet per second. But wait!, cried the 'engineers.' Those low-velocity rounds are all wrong, they said. They donít develop the muzzle energy of these new-fangled, higher-speed rounds, which depend on velocity squared to get their (largely misleading) high numbers. Thus, in todayís terms, a 9mm high-velocity round can equal the 'power' of a 45 ACP, at least on paper. In the real world, those with experience know this is not quite the whole picture. Many experts always go for the bigger bore with heavy bullets.

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