Yes. The spreadsheet looking chart shows different magazines and ammunition used that fail. I have over 30 that show the same bend, scratch and abrasion on the bullet. Been going on since prior to Dec. 2016 but got worse after Sig polished the ramps and I added the suppressor in July 2017. I've been slow to keep on top of the fail due to life creating other "emergencies". Now I'm close to sending it back to Sig again but I want to learn as much as possible and assemble some facts b4 trusting the rifle to shipping. The suppressor will live on this rifle and it needs to be reliable with whatever ammo I can both practice with and use in HD situations. I polished them again today using Fritz after repeated brass found on the M4 ramps on a high sharp spot on the ejection port side (right).
Last edited by masterdrago; 08-02-20 at 19:18.
Rarely will a rifle function 100% with multiple brands/weights of ammo. Tune to one brand of ammo, then run that.
Seems as if you have too heavy of dc a buffer. It’s my belief that since you replaced the extractor and spring, you should go back to a factory weight buffer and spring.
Also, concentrate on function and reliability, don’t get caught up on ejection.
The rifle came with a 3 position gas block (4 if you include the "no gas" setting). I'm fairly new to the AR platform but I thought I read that part of the reason for an adjustable gas block was to be able to shoot a variety of ammo. Several reviews of the Sig 516 mention that as a benefit. My Springfield Saint requires me to change a small screw. Four of various lengths came with that rifle. So far, I've been able to run several different brands/weights with it without changing those screws from the factory installed one. But the Sig can be changed on the fly (suppressed, normal, & adverse). All with different port sizes. So do you believe I'm asking too much for the rifle to digest both 75gr Hornady SBR as well as some form of 55 or 62gr FMJ? Or maybe low cost .223 for practice/plinking?
So here is a video I took on Aug. 1st. I ran several 10 round magazines at a high fire rate using my hot ammo (AE LC 55gr FMJ BT) without any jams. I know, not a big sample. Not sure if the gas valve of feed ramp polish did the repair. I'm going to experiment. I had installed a different gas block (for the 16" 516). The suppressed gas port is 0.001" smaller than the OEM. I also want to determine if the gun will run unsuppressed on the 0.059" setting. As I mentioned earlier, I had done some polishing on the ramps. I put a video of one of the magazine dumps at . Seems to be chambering out of the mag very well.
I'm planning to set up a spreadsheet of the next 300 rounds or so. I'm getting low on ammo, so it will be a mix of 5.56 and .223. Can anyone add any info that I should include in the spreadsheet? My list includes:
Ammo
# of rounds fired
Velocity
Fail yes/no
Suppressed or not
Buffer
Spring
Gas Port size
Date
I've taken some time to study your last two videos- one that shows the round getting jammed when feeding from the right side of the mag and the latter which shows ten rounds fired with no malfunctions.
What's interesting to note is the base of the round that jams stays low. Enough that the bolt almost over rides it. This puts the nose high entering the chamber and it looks like it catches on something. The timing of the BCG and the round as it's stripped from the mag looks off, like the carrier is too slow and losing momentum as it contacts the base of the case.
In the latter video, you can see that the bases of each and every round pops up higher sooner and the feed path into the chamber is much straighter. Timing looks more coordinated.
Whatever is causing the base of the case to stay low and the nose to go high is the source of your malfunction.
The number of folks on my Full Of Shit list grows everyday
I am American
I finally broke down and sent the full history and rifle to Sig on the 18th. Got it back just now with paperwork showing what was done. Again, Sig polished the feed ramps but replaced no parts. I've never seen bolt lugs this wet except for the one time I followed Sig owners manual and did mine like that. Made a cruddy mess of tacky carbonized goo. So instead I've been keeping the lugs dry like mentioned at https://www.cherrybalmz.com/post/how...um-reliability. See images. I'll get to hit it hard in a few days to check out.
Can't wait to see if it works for you. Hope so.
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