I played w/ the Polymer 80 Glock 17 w/ mixed results, most positive but moved on from them to reliable factory frames.
Had issues w/ Tac - Sol top ends in .22lr, not locking to the frame but standard 9mm ran fine, suppressed had several issues w/ lockup.
Takes time to work them in since the mill ends only take them down so far.
Would not due an AR unless it was metal and stripped lowers are pretty cheap now around $45, 80% are far more.If you are worried about them coming for your guns and want to be off the radar, better reload cause they will eventually track ammo purchases.
When it absolutely needs to be there, reload
Pareo Nullus (Obey None)