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I’ve been using a CMMG stainless steel version to great satisfaction and problem free functioning. There is a third company making these, located I think in Huntsville, AL. They make an excellent product but it is not stainless steel. You can order directly from them and save about $30 bucks per unit.

I passed on the SS version and picked up the non-SS model. It's very reliable, except with Remington ammo. :-) We've noticed that several people have accidentally bump-fired the weapon though. Have you had this happen?... or noticed it was easier to bump fire? We're not into overheating weapons and weren't trying...it just happened.

IF you're interested, I'll post a photo of a PVC tube I modified for storing the CMMG bolt. After about a week of having it, we realized that IF somebody dropped it and bent the chamber end, it would probably not fare well. So I modified a PVC tube for storing it. The tube usually stores the CMMG bolt. But when the .22 RF bolt is in the rifle, the stock bolt goes into the tube. It makes it easier to keep track of pieces-parts. :-)

My unit came in a tube with palstic caps. I wrapped the tube completely with electrical tape and taped on end shut. I stor the kit in the tube and the Carrier and bolt of the AR when using the .22 carrier/bolt. I don’t need to ‘bumpfire’ the conversion kit since I use it for practricing my sighting, targeting, and reload drills. If I want to just shoot .22 for a day of plinking I use a Ruger 1022 with hi cap mags. Did you know how easy those little Rugers are to make them full auto? There’s stuff on Youtube about it. Looks interesting, if we reach the SHTF scenario and lawlessness is the order of the day, I might convert one to have a movement suppressor.

Would love to see the PVC system you've devised. Always open to new and better systems. ;^) Here's a picture of a Ruger 1022 I 'worked on' to make it more a black rifle style usinf a shotgun collapsible stock with pistol grip ... it's the bottom one of the three; top one is a Mossberg Plinkster; middle one is a Marlin 795 in a draganov stock: