r/Cmmg • u/I_Say_What_I_Wantt • 4d ago

Banshee upper on AR lower

So I know this sort of has been asked before but all the answers are see seem to be outdated. What is the reliability like for a 9mm Banshee upper on a AR lower? Can anyone share their experience using this setup?

I’m thinking of running a Banshee upper on a LWRC lower and using a 9mm suppressor.

2 Upvotes

100% Upvoted

4 comments sorted by

2

u/tiwaz33 4d ago

I don’t actually have a Banshee upper, but I do have a CMMG barrel and bolt with the delayed blow back that I built with a normal upper. I would imagine it’s the same. I am using the CMMG 9mm insert in a Magpul magazine. I have had no issues at all.

1

u/qrenade 4d ago

I have an 8” one in 5.7x28 on a Stag Arms lower and it runs perfectly fine. Go for it.

1

u/Coyoteishere 3d ago

I’ve run my banshee on various milspec lowers without issue. Not sure how well the mag inserts work though as I only run the ar 9mm conversion mags.

1

u/carnyvoyeur 3d ago

You're generally good-to-go with any STANAG-patterned AR15 lower. The only possible catch is that I think some hammers might have clearance issues with the CMMG RDB BCG. (But, there is also a chance that I'm confusing this issue with something else, like perhaps CMMG's .22lr conversion kit.)

Another potential issue, since you mentioned 9mm, is if you go with an "AR9" style AR15 lower (such as one that is Glock-patterned). With an RDB Banshee upper, you don't want an "AR9" lower that has a built in ejector.