Caver Dave
Squirrel Herder
I've searched... Most findings are with a collections of parts/components that don't match mine or different symptoms.
Over a year ago, I purchased a (Diamondback?) .300BLK upper "4150 melonited 1/8" twist 16" barrel, pistol length gas". I needed something "easy shooting" (narrow gauge family members can't take the 12GA), decent mag capacity, with a bit more ompah than 5.56 (for larger "varmints"), 100% Supersonic use, and keeping the platform light.
I sat on it until late last year, as I wanted another lower, and purchased an assembled Anderson lower (unknown carbine buffer/spring) from a friend at Patriot Arms & Ammo (Appomattox, VA). I added a PSA NiB FA BCG & std. charging handle to the mix.
After finally getting it out few weeks back using 110gr Hornady Black, I could at most get 1-2 rounds before jamming... either not fully ejecting the spent case/not stripping & chambering the next round/both simultaneously.
Thinking it might be the mags, swapped between all I have (Troy, IMI, Magpul, & GI steel) with the same results. Pulled it all down, wiped, re-lubed, & assembled... same results.
That's when I started looking the symptoms and resolutions (gas port undersized, carbine length gas, too heavy BCG/buffer/spring, etc.), but nothing that jumped out... aside from some sources that said after a few hundred cycles, everything started running fine, attributed to "break in" (I can see all new components needing time to "slick up"). My assumption that the PO (@Flashpoint) mainly ran subsonics, so don't think there's anything wrong with the upper?
Please correct me if wrong, but:
It appears that undersized gas ports more an issue with carbine length gas than pistol length?
A FullAuto BCG is more of an issue running subsonics?
My carbine buffer/spring should be fine?
Will try different ammo, but not sure how much factory ammo would effect cycling in this case?
Any other ideas?
Over a year ago, I purchased a (Diamondback?) .300BLK upper "4150 melonited 1/8" twist 16" barrel, pistol length gas". I needed something "easy shooting" (narrow gauge family members can't take the 12GA), decent mag capacity, with a bit more ompah than 5.56 (for larger "varmints"), 100% Supersonic use, and keeping the platform light.
I sat on it until late last year, as I wanted another lower, and purchased an assembled Anderson lower (unknown carbine buffer/spring) from a friend at Patriot Arms & Ammo (Appomattox, VA). I added a PSA NiB FA BCG & std. charging handle to the mix.
After finally getting it out few weeks back using 110gr Hornady Black, I could at most get 1-2 rounds before jamming... either not fully ejecting the spent case/not stripping & chambering the next round/both simultaneously.
Thinking it might be the mags, swapped between all I have (Troy, IMI, Magpul, & GI steel) with the same results. Pulled it all down, wiped, re-lubed, & assembled... same results.
That's when I started looking the symptoms and resolutions (gas port undersized, carbine length gas, too heavy BCG/buffer/spring, etc.), but nothing that jumped out... aside from some sources that said after a few hundred cycles, everything started running fine, attributed to "break in" (I can see all new components needing time to "slick up"). My assumption that the PO (@Flashpoint) mainly ran subsonics, so don't think there's anything wrong with the upper?
Please correct me if wrong, but:
It appears that undersized gas ports more an issue with carbine length gas than pistol length?
A FullAuto BCG is more of an issue running subsonics?
My carbine buffer/spring should be fine?
Will try different ammo, but not sure how much factory ammo would effect cycling in this case?
Any other ideas?