Previously ran 200 rounds, no issues.
I ran 400 rounds approximately yesterday, at the very end, around 393 it failed to go forward. all the way,,
I could manually extract bolt no problem.
So, I cleaned BCG and rest of rifle as it very well as it was very dirty.
Today, after cleaning, I went to range again.
Fail to fully go forward.
Bolt will go forward without magazine. With magazine it stops. I tried 6 different mags. These are Magpuls 300BLK , Magpul 556 and D&H 556 mags.
And my upper has some interesting marks too.
Bolt slides down and locks with charging handle taken out to see if there is binding.
Any ideas?
Rifle is PSA lower, Geisselle SSA trigger, Upper PSA 300BLK 8.5 Inch barrel 1/8, PSA phosphate coated BCG with BCM extractor spring.
I was using 150Gr Freedomunitions 300BLK.
Here are some pics.
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