I have the CMMG 'India' 22 conversion kit for my Daniel Defense DDM4 V2.
It has been 100% and sccuracy is very good as well. I prefer this method because I get to keep the same trigger/optics/rail/stock/etc as my primary rifle... and can practice for much cheaper. Blow through 1 mag of 5.56 after shooting as much .22 as I want to blow out the gas tube and such...
Works great. I don't know if mine is so reliable because I got the complete kit or not... if I had it to do over again, I would probably buy the cheaper, basic conversion kit... but I'm very happy with mine.
Glock 17 OD | Glock 19 G4 | Glock 21 G4 | Glock 20 G4 | Springfield TRP Black | Smith & Wesson M&P 9 Pro | Smith & Wesson M&P 22
Daniel Defense DDM4 V4 | Arsenal SGL 21 | ASA SBR w/ Side Charger | Mega/PSA M4 Clone | Remington 700 SPS Tactical | Savage Mark II FV-SR
Mossberg 590A1 | Mossberg 500 Cruiser w/ 590 14" front end | Remington 870 Tactical