Re: DPMS SASS with Adams Arms Rifle length piston kit
There are plenty of 7.62x51 piston operated AR's on the market, each of which was purpose-designed and built as piston rifles...they are not converted DI guns. Besides the differences in pressure the 308/7.62 produces in comparison to the 223/5.56 rifles, there are fundamental design and dimensional differences between the platforms that prohibit an AR-15 conversion kit to work properly on an AR-10/LR-308 (i.e. - the piston/op rod for a 5.56 vs. a 7.62 system are totally different lengths). There are numerous manufacturers, including Adams Arms, that are working on 7.62 conversions for the AR-10/LR-308 platform rifles, but none are available yet.
If you would contact Adams Arms, their CS folks would be more than happy to walk you through the problems with doing what you are trying to do. I have had several conversations with folks who work their, including the owner Jason, about different projects from parts for non-Adams Arms weapons to complete setups for the 7.62 piston conversion.