If I can find one of those .22 conversions would said powderless ammo fire through a 1/7 barrel alright? higher danger of stuck bullets at all?  which ones better the government one or the ciener? I realize it more than likely would not cycle.

colibri's should work since there the same size as a regular 22
but it would would essentaly make your ar a bolt action since it most likely wouldnt cycle

have not tried cb rounds in AR. I was surprised at the penetration. shooting indoors they are quieter than an air rifle yet penetrated almost 2 inches into a sears catalog.

Better solution just as quiet. Size and Prime regular .223 cases. Then push a .22cal lead pellet in backwards. Will be quiet and pop pesky varmints at regular yard type distances

Colibris will not cycle. I have used them and they are virtually silent. You'll never get a silencer that good. It may have just been my old .22, but I found that Colibris had a much higher rate of duds. I've used .22 Shotshell and they are the most reliable of any .22 I've seen, but agin won't cycle. .22 Shotshells put a load of approximately #9 shot into a plastic bottle at 25 Yards, but do not penatrate beyond the bottle. They are kinda fun and won't do much damage.

I heard Colibris are great for those 8-round revolvers, but they lose power in rifles and of course, will not cycle any autos (not even my cheesy AR-7).

In fact, they would be great in the Taurus 94 with 2" or 4" barrel or the 970 Tracker. Great for shooting rats in the basement.