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Last edited by DontCome2MyHouse; 07-16-12 at 00:02.
In a DI AR the gas not only pushes the carrier rearward, but pushes the bolt forward during unlocking, removing pressure on the lugs.
On a piston AR the bolt is pulled back by the carrier during unlocking putting pressure on the lugs. This pressure can cause broken lugs.
The spring is a fix which pushes the bolt forward during unlocking as the carrier moves rearward.
Hope that makes sense.
I only ordered the 10" upper. I asked SIG if they make it in FDE and they said they do not.
You are going to be waiting a very very long time for a complete 10 " CQB rifle. Trust me. It would be quicker to do what I suggested. It would still be a factory SBR, but you're just getting the upper and lower at different times. Call SIG and see what they say.
Last edited by DontCome2MyHouse; 07-18-12 at 13:32.
I finally made it out to the range early Saturday morning. The weather was beautiful, 66 F without a cloud in the sky. No wind. Since this was my first time making it to the range this early in the morning I didn't account for the sun being directly behind my target. I was shooting pretty much directly into the sun which was horrible. I don't think this was thought out very well when this place was built. I was using an Eotech EXPS3-0 in FDE and the sun made it very difficult to get a crisp sight picture, but I did the best I could do.
I rested the SIG516 on a crappy rest that I was using for the very first time. I got it because it was cheap. I found that I had to pretty much adjust windage and elevation on the rest after EVERY shot which was really annoying. This thing was just too light to be effective, but it was better than my sandbag. I was using Lake City M855 62gr "green tip" ammo. I shot a total of about 200 rounds without a single malfunction of any kind. The trigger pull was better than average. A little better than my BCM. You can kinda stage the trigger which does help. I only used the NORMAL setting on the gas regulator. Next range trip I may try ADVERSE just to see what it feels like.
I made some slight modifications to my SIG516 prior to shooting it for the first time. I replaced the stock Cam Pin with the POF Roller Cam Pin. I'm happy to report that after 200 rounds there is ZERO wear from Cam Pin gouging on the inside of the upper receiver. The inside of my SIG516 is also Cerakoted in FDE and the finish in that area is perfectly fine. Now, I know Cam Pin gouging is perfectly normal and doesn't effect performance (my BCM has it), but I thought I would try this. The other modification I made was to replace the stock Buffer (3.7oz) with the Spikes Tactical ST-T2 Heavy Buffer (4oz). I use this Buffer on my BCM and I like it. I also removed the gas rings from the bolt. SIG Customer Service told me that they are not needed. The last modification I made was to use the BCMGUNFIGHTER Charging Handle w/ Mod 4 (MEDIUM) Latch.
The following picture was taken after shooting at 50 yards using the Eotech. Like I said previously the sun was in my eyes. Normally, I like to dim the red dot down to the point where I can just barely see it (makes the dot smaller) so that my groupings are tighter. In this case I had to crank up the brightness setting just to see the dot in the sun. I'm sure I could have had tighter groups and when I do I'll be sure to post them. I have read many reports of the SIG516 shooting 1 MOA to sub-MOA @ 100 yards.
I'm sure I'm forgetting something. Feel free to ask questions.
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Last edited by JSantoro; 07-23-12 at 11:03. Reason: Thread merge; no need for two threads RE: same gun, from same member.
That's awesome grouping for factory defensive ammo. I hope that the Sig516 can change the minds of all the piston and Sig haters on this site. I checked one out the other day at a local gun stores and was pretty impressed by the looks and feel of it. I wouldn't mind having one if I didn't already have my other AR's. Thanks for posting.
Looks great and shooting great even with the bad lighting. I just sold my Gen1 516 yesterday when I read your thread on AKforum regarding the Gen2. Now to find a Gen2 in CA. My LGS stated possible deliver of 516s in Dec.
The new piston/gas block design is what made me sell the other one. I did call Sig to see if they could retrofit the Gen1 but they stated that I would just have to buy a new upper. Not too many people know about the updated 516 so was happy to sell mine LNIB for $1300 when I got it for $1K.
The new gas block has a new bayo lug as well, have you tested or do you know if this would fit a standard M9/M10 bayonet now? Looking forward to get my hands on one and will probably get the same Eotech, but in black.
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Last edited by bigboypinoy; 07-22-12 at 12:10.
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