From CProducts website:
"If purchasing a 9mm magazine for use in a Rock River Rifle, you will need to adjust the magazine block .015-.020 lower to function properly in this platform."
This didn't work for me, but has for others. I gave up trying to get the CProducts mags (as well as the replacement mags that they sent) to work in any of my three 9mm carbines. I got rid of the CP mags and now use nothing but modified UZI and old Colt mags. And now, I'm a happy camper!
The only reason to pin the RRA mag block, is if you can't keep it in place with the internal pins. M60JOE (
http://www.m60joe.com/) can do a "pin" job if you really want one.
I have both Slash's 9-Q buffer and the Wolfe XP buffer springs in my carbines. No problem. And, I only feed them WWB and Miwall reloads.
The problem with broken bolt catches is the amount of overtravel as regards the 9mm bolt. Some folks use Slash's buffers, some use $2.75 worth of quarters stacked inside of the buffer tube. The idea is to limit overtravel to approximately 1/8".
Also, are you running a ramped bolt?
Take a look at these threads from TOS. You may find some interesting info.
http://www.ar15.com/forums/topic.html?b=3&f=15&t=379070
http://www.ar15.com/forums/topic.html?b=3&f=15&t=377013
http://ar15.com/forums/topic.html?b=...=355848&page=1
All in all, 9mm AR carbines are finicky creatures. There can be a lot of fine tuning involved in getting one to run correctly. Some run fine right out of the box.
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