![]() ![]() That answer determines which buffer and spring to use. Are you using a carbine stock or an A2 rifle stock. The PSA upper will not fit up to an aero lower. If you buy a PSA lower it will mate to the upper. These guys have been getting people's rifles to function for years if they listen to what is being told to them. Don't get butt hurt when a suggestion points to the fact that some of the parts you may have purchased aren't up to snuff. Take their recommendations to heart, listen to what they tell you and then do it. I'm sure someone with more diagnostic skill than I will chime in and make further suggestions. They do whatever they want with proprietary specs and parts then claim they will do things they don't. There are numerous threads here on the forum detailing many of the failures of PSA in trying to put out a functioning large frame AR. Do you have a carbine or rifle length buffer tube? A carbine spring/buffer will not work in a rifle tube, and a rifle spring/buffer will not work in a carbine tube. Companies that make parts for these big ARs throw around the term AR10 as if it is a universal term.IT ISN'T).īy the look of your spring/buffer picture you have a carbine spring and buffer from PSA and a rifle spring and buffer from Aero. It did not come out of the Armalite factory in any way shape or form. Its not uncommon for 308ARs made from parts from different companies to have issues. If the PSA upper and Aero lower do not mate up with no spring tension at all you have a case of the two pieces not made to the same tolerances and specs. This should tell you that it isn't a buffer/spring issue. Same issue, it is still slightly off, preventing the rear takedown pin from lining up. That way when the spring slams the buffer forward it doesn't snap off the buffer retainer pin.Ģ) Second issue- I removed the buffer and spring, and attempted to close with only the BCG/charging handle installed. The BCG should push back slightly against the buffer. That is exactly what is supposed to happen. ![]() As a result, I can engage the rear take down pin.the pin does not line up with upper receiver hole. I will close, but I can tell the two pieces are impacting. 1) First issue- with the BCG installed, when I try to seat the upper into the lower, the BCG strikes the buffer. ![]()
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