Quoted: I am guessing that thier Glock lower reciever is just a modified lower reciever that will accept Glock mags in 9mm and .40? Like a block in the magazine housing?
Are there Pistol caliber carbines any good?
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The "Glock" mag AR Oly sells does not use a block. The mag well is machined out to fit the Glock mag. It is a dedicated mag well. Not much difference between the two since the 9mm and 40 use the same sized mags- only a different upper.
About reliabilty....well, I have no experiance w/ their complete weopons. I assembled my own 45 ACP carbine using their upper and a Cav Arms MKII lower (uses grease gun mags). So far the combination I have works A-okay.
The upper came w/ one modified magazine. I think it's either a 10rounder or 16. Haven't even used it since I'm using my GG mags.