jhugz Posted June 14, 2014 Share Posted June 14, 2014 I'm new to the adjustable gas block game and would like some info on tuning the gas block. It's a SLR gas block w/ a Taccom ULW buffer tube, Comp, TT buffer spring, and a Boomfab BC. What's the best way to tune the gas. I'm literally looking for a "idiots guide to adjustable gas blocks" Thanks, -j Link to comment Share on other sites More sharing options...
mpom Posted June 15, 2014 Share Posted June 15, 2014 (edited) Did it not come with instructions on a card? Curious why you trust SLR to purchase their product, but not trust their instructions on adjusting it. Mine came with instructions, which worked quite well. Try it, and if not satisfied, ask if there is a better way. Suspect not. Edited June 15, 2014 by mpom Link to comment Share on other sites More sharing options...
ron169 Posted June 15, 2014 Share Posted June 15, 2014 If your looking for the optimal bras ejection angle, should be right at 3:30 - 4 o'clock Link to comment Share on other sites More sharing options...
ron169 Posted June 15, 2014 Share Posted June 15, 2014 See if this helps any Link to comment Share on other sites More sharing options...
LoganbillJ Posted June 15, 2014 Share Posted June 15, 2014 Turn you gas to the off position then one click out. Load 1 rd into your mag and fire the rd. Keep adjusting the gb until it will lock back reliably, no more, no less. One thing to keep in mind is if you shoot in the winter time or cold weather you may need to adjust your gas setting to compensate for the cold weather. Good luck! Link to comment Share on other sites More sharing options...
alma Posted June 15, 2014 Share Posted June 15, 2014 Turn you gas to the off position then one click out. Load 1 rd into your mag and fire the rd. Keep adjusting the gb until it will lock back reliably, no more, no less. One thing to keep in mind is if you shoot in the winter time or cold weather you may need to adjust your gas setting to compensate for the cold weather. Good luck!^^^ this Link to comment Share on other sites More sharing options...
openclassterror Posted June 15, 2014 Share Posted June 15, 2014 The ejection angle chart shown above is a good guide assuming you do not have any mechanical issues, and assuming you are using a forged type upper with brass deflector. Often slick-side DPMS uppers eject between 4:30 and 6:00 even when properly gassed, and if you have an extractor with too sharp a hook or burrs, it will release the brass late, giving symptoms of other issues. If you are re-using your bolt head, and it gave good service before, a combination of the two ideas above is best. Start with too little gas (deliberate short-stroke), then increase until it reliably locks the bolt back on an empty mag. Look at where your brass lands to ensure you didn't go too far. Goes without saying you must use a quality mag that was working the bolt latch properly to begin with. Link to comment Share on other sites More sharing options...
jhugz Posted June 15, 2014 Author Share Posted June 15, 2014 It's a DPMS slick slide lefty upper so the chart won't quite work as is. I didn't receive the product yet but I'm glad the gas block has good directions. I'm not doubting SLR just wanted to get a head start on what I needed to do. Thanks for the input. Link to comment Share on other sites More sharing options...
jhugz Posted June 15, 2014 Author Share Posted June 15, 2014 Turn you gas to the off position then one click out. Load 1 rd into your mag and fire the rd. Keep adjusting the gb until it will lock back reliably, no more, no less. One thing to keep in mind is if you shoot in the winter time or cold weather you may need to adjust your gas setting to compensate for the cold weather. Good luck! In cold weather air is more dense, so would I remove clicks? Link to comment Share on other sites More sharing options...
alma Posted June 15, 2014 Share Posted June 15, 2014 More gas needed when cold Link to comment Share on other sites More sharing options...
mpom Posted June 15, 2014 Share Posted June 15, 2014 (edited) Sorry that I came across as a smart ass, did not know you did not have the instructions. Use the weakest ammo you have, so it will function reliably with all ammo. I ended up on setting #4, from fully closed, many folks end up at setting 5. You can also experiment with lighter buffers, but setting might have to be changed if the buffer is changed. Main thing as everyone says, 100% lock back on empty is key, not so much ejection pattern. Edited June 15, 2014 by mpom Link to comment Share on other sites More sharing options...
AustinWolv Posted June 16, 2014 Share Posted June 16, 2014 Just set up similar rig recently: SLR block, TTI buffer spring, JP LMOS, TACCOM ULW Chilled my ammo in the freezer before heading to the range and kept them in a soft cooler to stay cool. Ended up at setting 5. The Boomfab carrier might let you run at setting 4. Link to comment Share on other sites More sharing options...
NisilS14 Posted June 17, 2014 Share Posted June 17, 2014 (edited) JP SCS, and LMOS put me at 5 clicks for reliable lock back w/ PMC bronze. 4 clicks would lock back about 50% of time. A full weight system is at 8 clicks or so. Edited June 17, 2014 by NisilS14 Link to comment Share on other sites More sharing options...
BitchinCamaro Posted June 17, 2014 Share Posted June 17, 2014 Chilled my ammo in the freezer before heading to the range and kept them in a soft cooler to stay cool. Clever. Utah= 100+ degreeF summer days, -20 degreeF winter nights. In addition to a suppressor and developing handloads, I'm always futzing around with the gas block. Link to comment Share on other sites More sharing options...
BitchinCamaro Posted June 17, 2014 Share Posted June 17, 2014 (edited) It's a DPMS slick slide lefty upper so the chart won't quite work as is. My upper is slickside as well. Brass seems to fly over my strongside shoulder into a nice little pile. After you have your setting dialed adjusting from closed to open, I would suggest opening the block all the way and also adjusting down towards closed: Hopefully you'll reach the same setting, but the benefit would be that you'll feel and hear what "overgassed" is for your system and get a better feel for the sweet spot of your rifle. Edited June 17, 2014 by BitchinCamaro Link to comment Share on other sites More sharing options...
AustinWolv Posted June 18, 2014 Share Posted June 18, 2014 Chilled my ammo in the freezer before heading to the range and kept them in a soft cooler to stay cool. Clever. Utah= 100+ degreeF summer days, -20 degreeF winter nights. In addition to a suppressor and developing handloads, I'm always futzing around with the gas block. Can't take credit for it, as I saw it mentioned somewhere before. Being that it is warm weather out, I didn't want to have to go back and set the gas block all over again once cooler/cold weather hit later in the fall, i.e. reliable set it and forget it is what I prefer. Link to comment Share on other sites More sharing options...
openclassterror Posted June 18, 2014 Share Posted June 18, 2014 CAREFUL! You need to maintain some sort of alibi for matches where you choke! " I WOULDA won, but my AR's gas block was off by a click, and it jammed once. THAT's why I was 32nd!" Link to comment Share on other sites More sharing options...
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