Quoted: I believe they would be a lot better without the furniture attached to them.
It limits your options.
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Every time somebody suggests a telescoping version they say that making that work would negate the advantages of being polymer. If you need the options, get an aluminum lower.
Are they durable enough for SHTF considerations?
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The only broken lower I can recall was a .45 that cracked from the bolt hitting it because the buffer was too light. I'd consider it durable enough for SHTF, but if your scenario includes limited access to spare parts you might want to stick to an aluminum one.
Any known problems with them?
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Mine was an
extremely tight fit on my uppers. In fact, I sent it back because I couldn't get any of my three uppers to fit. They said it fit all of theirs and sent it back. When I got it back I could just barely get mine to go on. Apparently the tight fit it typical. And that's not necessarily a bad thing.
The pistol grip shape is different from a regular AR, which you may or may not like. The distance from the back of the grip to the trigger is longer, which IMHO feels nicer, but the reach to the safety and mag release are also longer. I can just barely reach them, so if you have short fingers you might have trouble.
The only functional "problem" I've had is that 20-round mags are hit-or-miss on dropping free. The CavArms lower doesn't have the groove at the front of the mag well for the rivets on the front of the 20s, which I think is why they hang up. The 30s don't have the rivets and usually drop free.