[Charles Martel]

Yeah, Black Dog Machine does sell some nice products. I've got a Ceiner conversion, ended up modifying it to work in a dedicated rimfire upper. The correct bore and chamber dimensions do make a difference.

I used a Bushmaster Carbon upper receiver and a Model 1 Sales .22LR M4 profile barrel. Got the adapter part for the Ceiner unit (a collar that slips over the breech end of the rimfire barrel, which snaps in place of the chamber insert) from Spike's Tactical.

[mylife]

Thats 3 thumbs up for Blackdog Machine.

Thanks for the input.

[mylife]

The correct bore and chamber dimensions do make a difference.

Yes, the AR15 22 conversions are going to be less accurate. Its a 22 down a 223 pipe