QB78 repeating breachs, what's avaiable ?

I think a repeating breach on the AR2078 would be sweet. I have found 2 similar ones in the UK.
GMAC
http://www.gmaccustomparts.com/epage...cts/QB-RIM1-22
and Rowan
http://rowanengineering.com/products3.htm

Are either or both of these any good? pros and cons?
I believe JRA used to make a decent repeating breach, but no longer produced.
Thanks for any info.

Here are some groups shot with my 2078 Fitco scope 12x @ 10m - JSB Exact Jumbo RS - 5 shots on each target (12mm black circle). First two top left before fine tuning scope - scope adjusted on the third from left top. I got just shy of 60 good shots on bulk fill you can see the last 3 shots on the last target falling low. Looks like gas efficiency improved by the polishing/reseal job! And look... no flyers.:chuncky:
Attachment 122

The unit you linked from GMAC is the JRA unit.

Both of the units linked, however, are rotating (manual) magazines. I believe there are no proper QB rotating breeches where cocking it (pull bolt) rotates the magazine without the shooter turning it manually. Two are currently in development- one is, as far as I know, still on schedule, the other I have no idea if it will ever come to market.

The rotating magazine units, like the ones you have linked work OK, but you cannot use with open sights and must use tall scope mounts on a small scope to be able to load/rotate them correctly.

Looks good Duke. Try fiddling with the amount of tension on the barrel band screw. Loosen it right off and shoot a group every half turn. Fun watching the group change.

There is word that Sergio Lorenzo will be doing them soon. http://bnm111.hpage.co.in/bnm__custo..._57060210.html You may want to contact him.