5.7 Johnson and M1 Carbine

[eb in oregon]

Years go I read an article wherein the author made up a 5.7 on a carbine. He cut the barrel off outboard from the gas block, bored out the stump, and sleeved in a .22 barrel. Did it this way to preserve the slide grooves in the barrel.

That individual may have done so when barrels were difficult to come by and I recall once seeing something the same. Conversions of .30 caliber barrels to a smaller caliber by boring out the original barrel and sleeving. And too if the proper twist rate is used I see little difficulty in using a .22 liner. Some liners have thicker walls than others and probably can be used to change caliber.

As for the issue of Plainfield's being used by the US government this might help clear up the picture.

Plainfield Machine Company