FastbackJon Posted January 14, 2018 Report Posted January 14, 2018 DPMS GII MOE New rifle, just breaking in. Having some failure to feed issues. Seeing dented brass even when no failure to feed. So I check out the feed ramps and see the DPMS detachable steel feed ramp sits quite a bit higher than the ramps in the lower. Should I be concerned about this? If so send it back or dremel it myself? Thanks!
Robocop1051 Posted January 14, 2018 Report Posted January 14, 2018 Soft points.... 308’s hate them. The OAL of a SP cartridge is about 1/8” shorter than a FMJ or polymer tipped cartridge. The jump from the magazine to the chamber is too long.
308kiwi Posted January 14, 2018 Report Posted January 14, 2018 ^^^^what Robocop said, short OAL loads. Have seen exactly the same with .223 55gr softpoints seated deep and being fed in an AR15
survivalshop Posted January 14, 2018 Report Posted January 14, 2018 Agree with Robocop , soft points work for some rifles , but mostly an issue waiting to happen . If you shave some lead off the tip & it may not be a one time event , it may find its way into the Chamber & could cause a dangerous Head Space issue , why take the chance . Take a photo with a loaded mag in the Rifle , looking through the Ejection Port , to see what angle the Cartridge is at , you could have a Magazine issue . If Metal mag ( DPMS ) the feed lips could need tweaking . If you think the Feed Ramps are not blended correctly , you can send it back in or Blend them your self , if you feel you are capable of doing it properly . I would try different ammo , because DPMS is going to tell you to use some kind of match ammo or something . I look at it this way , any 308AR should have no issues feeding & firing M80 Ball ammo , try a box of it . The Brass looks like it has Ejection marks or Bolt Locking Lug marks on them from being pinched in the Chamber area , when not fed into the Chamber .
shepp Posted January 14, 2018 Report Posted January 14, 2018 Welcome to the forum feel free to tell us about yourself in the intro section
mrmackc Posted January 14, 2018 Report Posted January 14, 2018 Yes I would remove the bolt and bolt carrier of my reassembled DPMS LR308 and take pictures of an inserted loaded magazine or two with different styled and weight 7.62 and.308 rounds to see how they align with the feed ramp.
Robocop1051 Posted January 14, 2018 Report Posted January 14, 2018 You can “trick” your rifle... when the mag is loaded, slap the mag forward and force the cartridges as far forward as possible. This will leave the seat behind the cartridge, rather than in front. It’s not great for long term storage and humping, but should work for range.
FastbackJon Posted January 15, 2018 Author Report Posted January 15, 2018 Thanks for the info on the soft points. I'll start using ball ammo only going forward. And good tips on the magazine. I have been using PMAG Gen3. The brass rounds from Federal actually cycled better than the steel cased Tula 150g ball ammo rated at 2800 fps (yeah, I know, but it was cheap). I believe those were short stroking where the bolt carrier wouldn't get pushed back far enough to grab the rear of the cartridge, and instead the carrier would run along the side and put a big scratch in it. The rifle should be adequately lubed, so from what I read it's either not broken in enough yet, the buffer is too stiff, it is under gassed, or the rounds are weak. I was mostly wondering about the alignment ridge in the middle of the feed ramp and the dents in the brass, but no one seems to think the feed ramp is a concern. I'll get some M80 ball brass cased ammo and see how that runs.
bfoosh006 Posted January 15, 2018 Report Posted January 15, 2018 The feed ramps are fine, as long as they are smooth and your rifle feeds properly. And, believe it or not, the dents are from the ejection cycle... the cases are banging the case deflector or even the ejection port. You would be surprised how much .308 cases fly around upon ejection ( P.S. ..NOT extraction ).. spinning etc... Personally... ( and YMMV ) I'd plan on slowing the cyclic speed. An adjustable GB might be in your future....
shepp Posted January 15, 2018 Report Posted January 15, 2018 2 hours ago, FastbackJon said: Thanks for the info on the soft points. I'll start using ball ammo only going forward. And good tips on the magazine. I have been using PMAG Gen3. The brass rounds from Federal actually cycled better than the steel cased Tula 150g ball ammo rated at 2800 fps (yeah, I know, but it was cheap). I believe those were short stroking where the bolt carrier wouldn't get pushed back far enough to grab the rear of the cartridge, and instead the carrier would run along the side and put a big scratch in it. The rifle should be adequately lubed, so from what I read it's either not broken in enough yet, the buffer is too stiff, it is under gassed, or the rounds are weak. I was mostly wondering about the alignment ridge in the middle of the feed ramp and the dents in the brass, but no one seems to think the feed ramp is a concern. I'll get some M80 ball brass cased ammo and see how that runs. More lube the better
FreeMan Posted January 15, 2018 Report Posted January 15, 2018 (edited) My G2 is still new to me but in 250rnds I didn't have a malfunction. I shoot polymer tip cartridges too(Hornady Black). I was strongly advised to invest in Lancer Magazines by DPMS and the FFL. This was based on some failure to feed issues reported by shooters using Pmags and even the factory steel mag. It may be worth a try to see if Lancer mags help. Edited January 15, 2018 by FreeMan
98Z5V Posted January 16, 2018 Report Posted January 16, 2018 5 hours ago, unforgiven said: Lancer's are the $hit. ^^^ I was just getting ready to say that...
FastbackJon Posted January 16, 2018 Author Report Posted January 16, 2018 Lancers, I'll check that out. Thank you.
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