AR Sponsor
Posted: 6/10/2007 2:56:33 PM EDT
|
Hey all, After looking over the various kits, including Ciener, the Air Force, and the 261, I decided to go with the M261 .22 conversion, as I plan to build a dedicated upper with it, based around a barrel from Frank White/Compass Lake. I purchased one in 100% condition from another member, and have had a few issues with it. The problem I ran into was that the Bushmaster match trigger was not reliably igniting the .22 rounds. I first changed the firing pin profile from round to chisel tip, and this improved things, but did not solve the problem. I also lightly polished the bearing surfaces of the guide rail/bolt slot, but still no joy. Finally, I removed the firing pin return spring, on the off chance that this extra spring pressure was causing enough resistance to the light trigger/hammer combo. Success at last! This mod allowed me to go through about a hundred rounds of .22 on an unlubed kit, with only "numerous" stoppages (vs every other shot). Now, in looking at the kit, the chamber of the adaptor has numerous machine marks in it. These marks are only in the case portion of the chamber, not the long extension, which is very smooth. Questions: Is the presence of machine marks in the chambers of these kits common, and has anyone polished theirs - if so, did it improve extraction? Second, what lube works best - none, light CLP, heavy CLP, dry teflon lube, etc? |
|
Moderate CLP. Firing pin spring - I only had problems on the AF conversion which I fixed by cutting a length of the Lakeside recoil spring and replacing the original. AF kit would not fire at all with the original FP spring. Running a Accuracy Speaks match hammer and trigger. 261 - no problems with ignition with the match trigger group. YMMV |
The barrel of the M261 is removed when you go to the dedicated .22LR barrel. |
AR Sponsor