9mm AR Feeding Issues

[Paulinski]

Took my new 9mm SBR to the range last night. Not a very good night as I experienced a lot of jams. Mostly FTF.

Here is my set up

RRA Factory 10.5" Upper
9mm Hammer, Buffer, Spring
Stag Lower and LPK
Hahn Dedicated Mag Block
RRA Polymer Magazines.

I only had 2 mags for it basically what happens is dropping a bolt will result in a round pushing up and jamming right above the chamber. Easing the bolt back a little and letting it go again chambers the round.

Ammo tried

IVI Nato Load, 147 Grain Federal and 147 Grain Rem +P

I'm thinking and maybe the combo of 9mm Buffer, RRA carrier is to heavy and slamming too hard on the round to push it up. I think I'm going to try Carabine buffer next.

Any opinions?

Pic of the weapon.

http://i39.photobucket.com/albums/e193/Dragnaath/9mm-Resize.jpg

[rob_s]

Someone posted elsewhere that he relieved the top of the mag-catch notch on his magazines so they sit lower. May help you. Although those polymer mags don't have the best reputation.

[Paulinski]

I'm trying to get some Colt 9mm magazines as well.

[rob_s]

I ordered a pair of these (http://www.botachtactical.com/co9mm30ma.html) and they came without issue. Not generally a Botach fan, but it worked out this time. Going to order two more (thanks for reminding me).

[smith m4]

C Products 9mm Mags worked flawlessly in my RR 9mm.

The Colt Mags I have jammed up everytime and are now for sale.

[Paulinski]

I relieved the top of mag catch on one of my polymer magazines.

I have 3 Colt 32 round magazines coming is as well. I'm also going to try some C-Products mags.

Thanks for everyones help I really like shooting this 9mm SBR.

Paul