Jephthah

I do not have the wherewithal to successfully undertake the gas port system evaluation and R+R . Still am trying to wrap my head around the reason why the rifle works great with heavier rounds. Is it because the round stays longer in the barrel (do to weight) and then the accumulation of gas pressure is adequate for recycling...and the lighter rounds exit sooner (also due to diminished weight) as well as the gas that would otherwise be recycling the next round? Sorry I am a Carpenter not a machinist. How would I order a new completed upper if I can not insure the system is up to par? Recommendations?

Aloha, I have a .308 Buffer Spring (11 1/16'') and a CAR-10XH Buffer weight (6.61 oz.) from Clint for my 7'' Buffer tube. Thanks I will look into measuring next...

That is correct... Clint @ Heavy Buffers...my bad... regarding specs on my .308 I did not build this gun ... I mentioned "home built" as opposed to "store bought". Fact is I received the lower from family friend several years back and then after that I acquired the "completed upper receiver" from Daytona Tactical. The upper is a .308 WIN w/ a 20'' barrel and 1:10 twist. When I first tried firing the rifle there was all sorts of problems... light strikes...I bought /replaced hammer spring, feeding / ejection cluster f*&^%ks with any .308 ammo I tried. Then after replacing buffer and spring only issues were with ammo lighter than 168 grain. Once I tried the 150 grain then feeding/ejection cluster again after first shot. That is basically all I have at this point. Thanks again in advance.

My .308 rifle is cycling flawlessly with 168 grain and above ...however I purchased plenty rounds at 150 ish during the lockdown that do not seem to like my homebuilt. I purchased completed upper from reputable source. Also purchased larger / heavier buffer from Cliff @ heavy buffers and only concern is why not performing with lower grain ammo. Mahalo for your feedback in advance, Aloha, Jeff