Hi Jim, you have made a lovely job of that carbine. There are quite a few dedicated 22 AR type rifles and carbines appearing in the UKthese days from the likes of CMMG and Spikes but I think the Bremmer dates back to the 1990's. They also made a full length AR15A2 version. Unfortunately they were expensive at the time so did not sell very well. Mine shoots very well with CCI Mini Mags and uses Black Dog M261 / Olympic magazines.
Regards,
John.