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meatman | 05-13-2009 04:49 PM
Lowers now I have been buying ARs for a while but its been complete rifles but over the last few months started building them myself and been keeping 223/556 lowers with 223/556 uppers But since all the lowers I have left are 223/556 and I want to make a AR-57 can I use a 223/556 lower and a 5.72x28 upper to make a complete or is there laws against mixing

JJ_ | 05-13-2009 04:55 PM
Re: Lowers this design looks like it utilizes standard lowers... http://www.57center.com/22.html Can't see how it'd be illegal. most of em seem to be geared to eject thru the mag well.

JJ_ | 05-13-2009 05:07 PM
Re: Lowers http://www.impactguns.com/store/AR-57%20UR.html Quote:
Magazine not included, uses standard FN P90 mags (50 Rounds!) This highly anticipated upper is a direct replacement for your standard AR upper that will allow you to shoot the FNH 5.7 round. This upper requires no FFL to purchase or receive, and we can ship directly to your home! The AR-57 platform empowers the operator with 50 rounds of firepower while keeping the magazine out of the way, increasing maneuverability and speed in close quarters conflicts. In addition to it's compact, snag-free design, the spent shells are directed straight towards the floor by exiting the standard AR magwell. The upper receiver and rails are precisely milled from a monolithic block of aircraft grade 7075 T6 aluminum. Any sighting systems mounted on the rails will stay zeroed through the toughest of missions. Designed with reliability as its primary feature. There is no gas system to become clogged with carbon or fouling and maintenance is a snap. The bolt and chamber stay clean through extended shooting sessions. This new offering defines "High speed, low drag".

AG Capone | 05-13-2009 05:09 PM
Re: Lowers I've heard people saying they are concerned with the ATF declaring(in the future) that one reciever marked for 5.56 can only be used with that same caliber upper in the future. Making it illegal to mount other uppers. There are AR lowers out there marked "Multi-Cal". This should get around that issue if it comes up in the future.

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