The first testing configuration consisted of an AGP Arms forged lower with one of their side folding stock assemblies. This stock folds flush to the right side of the receiver and isn’t blocked from doing so by the charging handle. The downside with folding to the right is the BRN-180 ca...
The bolt carrier rides on two guides with springs that are located within the upper receiver, so the BRN-180 can accept a side-folding stock. Because the BRN-180 fits onto an AR-15 lower, you can use standard AR-15 magazines rather than having to hunt for original AR-180 mags, and ...
So for BRN-180 builders, if you choose a BRN-180 Lower, there are multiple options for your stock attachment. These include using an AR folding tube adapter or a Picatinny adapter to accommodate a SIG MCX folding stock, which, incidentally, derives its design from the original AR-180 system...
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