The AR Air Rifle: The Crosman MAR177 PCP Conversion Kit - The Firearm Blog
V. Interesting actually. Allows an air-rifle upper to be used on your AR lower (E-cat air rifle anyone?)
Good way to do alot of cheap, cheap training because the setup uses your normal AR trigger.
People are going to say "Oh but i've got a 22 upper for that." Yeah, but can you buy a box of 500 22 rounds for $10?
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