Reviews & Ratings for Stern Defense SD BU9 NiB ECHO 9mm Bolt Carrier for AR-15 Glock-Pattern Upper Receiver — 14 reviews — Page 1

No issues runs smooth and great. Running with milspec lower ar15

I have not installed this bcg yet but out of the box it's great looking. No blemishes or burs.

Put this into an Aero EPC 9mm. Looks great with the nickel finish and has worked flawlessly to this point. Would definitely buy again

This bcg9mm has been my favorite so far used with multiple different uppers 3in + 7.5in + 10.5in not a single hiccup and cleaning it is a breeze to getting it looking back to new out of the box . I have one from trybe the standard finish “cheepest one they sell”, even with that one I have had no problems with it. But by far I wish I would have known about this one first I wouldn’t have bought the trybe. Lol but I ain’t hating

I'm not able to make this work with Echo Sport, yet. I *think* I have an H2 buffer and don't think the Strike flat-wound springs are as stout as Tubb flat-wounds. Or maybe you need the regular Echo. That said, the carrier worked flawlessly in conjunction with a Matador Mag-X adapter. Not saying it won't, just I think I need to tweak parts to get it going.

I have this bolt in 3 build with zero issues in any of them.

It comes with a removable weight, which I've removed to use a armaspec 9mm stealth recoil spring.

When it comes to cleaning I chuck it in my ultra sonic and it looks brand new.

The bolt I had been using functioned but showed signs of deformation along the bottom as a result of hammer "bounce". This indicates problems elsewhere, but the fact that old bolt was soft enough to record these impacts indicates the bolt was too soft. The Stern Defense version is a daylight/dark difference. The machining and surface finish is superb. Function is 100%.

This is absolutely one of my favorite bcgs. Extremely easy to clean and liquid smooth. No issues whatsoever with it. Made operating my 9mm AR a cinch. Would and will definitely recommend to others. Hopefully in the future I’ll get me a echo trigger to check it’s double action functions.

It's works perfectly glad that I bought it would recommend it to others... I Love the way it looks inside my Gun.... The action on it is very smooth no jamming Just a all around great product I'm glad I bought it going to use it in another gun that I'm about to build

I ordered this BCG on a Friday and got it the following Thursday. Optics planet has THE quickest shipping and best prices!! As far as the stern NiB BCG goes this thing is sweet @$$ sweet! Very easy to clean extracts reliably every time doesn't nose dive rounds. Ive put over 450 rounds thruand nota single issue! I have it matched up with the trybe "10.5 barrel and its a perfect pair up! The bolt actually has allen screws that hold in the weight and the extractor. I haven't ran it with the echo trigger just only a mil spec and its just lovely!!! I haven't seen many 9mm bcg's in the NiB coating but this stern bcg is soo worth the $!! Stern is high quality for the more poor people of the world! I appreciate the quality and without breaking me!!!! Im planning on pairing it up with a JP barrel next but would NEVER change out the stern bcg!! Thanks again to Optics Planet for the quick shipping and BEST PRICES!!! And thank stern defense for helping out the poor man!!!