I don't think so with either question, I have some mil spec forged lowers that are 20 years old and still work just fine, the machine work matters more about fitting, most fit. DPMS can be very tight so that I have to drive the pins in instead of push the pins in.
5.56, 6.8, SIX5. The Nexgen of 308s
To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.