
Finally running like it should. Colt mag lower > Colt mag adaptor
Build list: spikes colt mag lower, milspec trigger, milspec carbine buffer tube and HAR brace,matrix 9mm upper, KVP bolt, KVP 10oz extended buffer, carbine buffer spring, BA EPC 5.5 barrel, warhammer CH, prisma 4.2 handguard, noveske tri lug MD, DAC VCG grip, Romeo5 elite, harbor freight tlr1 clone, YHM r9
A few months ago I posted on here about my build and was using the standard R&D colt mag adapter with PSA lower. I did the snake bite mod and properly adjusted my ejector, but kept running into problems.
No matter how hard I tried to secure the adaptor it would always slide up with inserting a mag with the slightest amount of force. I eventually gave up on it and decided to give the spikes lower a shot. And man am I happy I did. This thing ran great right out of the box. I even contacted spikes to get a second ejector as a backup, if I ended up adjusting mine wrong. Well I guess I got lucky, because out of the box even with the ejector not perfect, this thing has run flawlessly suppressed and unsuppressed. Both the C product and metal form mags feed and fit great. LRBHO has worked on everything, and I’m finally happy to have an AR9 that can run with a little abuse.
If you’re thinking of making a colt mag style I highly recommend just spending a little bit of money and getting a dedicated lower.