AverageJones said:
Thinking about building an AR-9, anyone have any tips/suggestions?
The Glock magazines are a little more relianle, but their bolt catch systems, if they have one are less reliable. The Glock magazines, if you use factory Glock mags are more reliable because of their tapered design they stay cleaner..
The Colt pattern AR9 are the same as a regular AR.
Go with a heavily sprung, lightweight recoil system
There are pros and cons to them all. JP makes good part, but they are quite pricey. I have a JP bolt and recoil system on the Colt pattern 9mm AR I built for Dubi.
Spikes Colt pattern lower, Anderson slick sided upper, JP bolt, JP 9mm SCS, ALG QMS trigger, Ballistic Advantage 16" barrel, Custom Muzzle Brake 9mm comp/brake, Palmetto lower build kit with ambi safety ATI handguard, Krylon paint. I use metalform magazines, they need to be cleaned after about five uses.
By the time I finished the ultimate build, if I had paid full price on all the parts, it would have cost almost as much as buying a nicer one one off the shelf.
I like they idea of the Glock magazine reliability, but I also like the Colt pattern layout and parts interchangeability with real AR's.