I thought I would share a photo and link to Rimfire Central about the BCA 17HMR uppers. For what ever reason BCA decided to go with a straight blow back system which doesn't work well with 17m2 or 17HMR.

Here is the link to the thread on Rimfire Central: BCA AR Upper 17 HMR KABOOM

And here is a photo from that thread.

Attached File


Needles to say the person did get injured from this. I definitely would not use one of these users if you are a left handed shooter.