FREE RIFLEMAN Posted February 25, 2011 Report Share Posted February 25, 2011 DPMS OEM SASS .750 gas block measures .7461 inside diameter... how tight is TOO tight? The Fulton/Criterion measures .7535... Quote Link to comment Share on other sites More sharing options...
imschur Posted February 25, 2011 Report Share Posted February 25, 2011 That stinks. It seems the DPMS SASS barrel and gas block are unique in many dimensions. We have had other posts on the subject. Might be better served with an MI and probably half the price.That is too tight. I have never thought to actually measure the .750 dimension to see what it really measures. Quote Link to comment Share on other sites More sharing options...
6132expert Posted February 25, 2011 Report Share Posted February 25, 2011 Anything thatis mass produced is subject to error........if you look into it there is probably a + -.10 Quote Link to comment Share on other sites More sharing options...
FREE RIFLEMAN Posted February 25, 2011 Author Report Share Posted February 25, 2011 I'm contemplating sending the DPMS SASS gasblock back. It's heavy. I really don't want to increase the diameter and I have yet to paint. Everything is getting Duracoat's MAGPUL FDE. Quote Link to comment Share on other sites More sharing options...
imschur Posted February 25, 2011 Report Share Posted February 25, 2011 send it back Quote Link to comment Share on other sites More sharing options...
98Z5V Posted February 26, 2011 Report Share Posted February 26, 2011 DPMS OEM SASS .750 gas block measures .7461 inside diameter... how tight is TOO tight? The Fulton/Criterion measures .7535...I think the issue might be the combination. DPMS SASS and a non-SASS barrel (the Fulton). I'm pretty sure that if you're using DPMS SASS barrels, the only thing that's gonna fit will be a DPMS SASS gas block - and vice versa. Those DPMS SASS-specific parts aren't gonna combine with anything else out there, and nothing is gonna combine with them.I run a PRI gas block on my Fulton barrel (both are .936" parts) and there's no issue. What fulton Criterion barrel do you have that's .750" ? Is that the CroMoly lightweight one? Quote Link to comment Share on other sites More sharing options...
6132expert Posted February 26, 2011 Report Share Posted February 26, 2011 I get what you are saying , but if it is sold as a .750 then that is what it should be no questions ask. If the barrel is suppose to be a .750 and the gas block is suppose to be a .750 then they should work together. I am also sure they give a + or - toleracne on these parts also. Quote Link to comment Share on other sites More sharing options...
imschur Posted February 26, 2011 Report Share Posted February 26, 2011 I think the manufacturers of barrels and gas blocks state .750 and .936 as to keep it simple for everyone. If you look at the actual specs the sizes vary a bit but we never see this problem of fit. The problem is DPMS trying to change the game so their weapons are proprietary. Unfortunately the problems don't show up until guys already have the DPMS hardware. Quote Link to comment Share on other sites More sharing options...
FREE RIFLEMAN Posted February 26, 2011 Author Report Share Posted February 26, 2011 Sure. I went with the heavy SASS block because the DPMS engineer had me convinced every other gas block would fail eventually because it being a .308... I'm looking at my 5.56 build and seeing a Troy low-profile slide right on and I'm saying, "maybe I should have bought two?" (Sure enough... the Troy for my 14.5 BCM build slides on the Criterion/Fulton without fanfare...)Looking at the picture, do you think this gas block will under perform for the .308? Quote Link to comment Share on other sites More sharing options...
imschur Posted February 26, 2011 Report Share Posted February 26, 2011 Going to take A LOT of shooting (and cash) to burn out a steel gas block. Dont sweat it. Quote Link to comment Share on other sites More sharing options...
imschur Posted February 26, 2011 Report Share Posted February 26, 2011 I really try to be impartial about the various brands but man DPMS is making a strong case to put on the avoid list for those that like to tinker.I did the SASS barrel and gas block just to see it all first hand. Fortunately I got a deal on the barrel that somewhat offset the stupid price of the gas block. Quote Link to comment Share on other sites More sharing options...
survivalshop Posted February 27, 2011 Report Share Posted February 27, 2011 DPMS ,I believe makes a good rifle for the most part ,but if I need any part ,I will be looking else where for it .They may think going proprietary is going to keep them in sales ,but they are wrong. The good thing about the way it was before is, you could customize there rifles with what you wanted ,now it seems , you have to do it with there parts. They may think its a good position for future sales ,but it not . Turns too many away.Its like ,why not make a chrome lined barrel ? They would sell more if they did ,but don't have one ,why ?Luckily ,other manufactures are making components ,that only DPMS used to make in the past .I want to see more manufacturers make bolt carrier groups made out there though . Its nice SI Defence is going to come out with one . Quote Link to comment Share on other sites More sharing options...
FREE RIFLEMAN Posted February 27, 2011 Author Report Share Posted February 27, 2011 I got my Troy from a local dealer who happened to have another of the exact same model... problem solved. DPMS is getting a call for return numbers in the morning.... I'm just sayin... Quote Link to comment Share on other sites More sharing options...
imschur Posted February 27, 2011 Report Share Posted February 27, 2011 Good move. You going to mention the fit issue? Quote Link to comment Share on other sites More sharing options...
survivalshop Posted February 28, 2011 Report Share Posted February 28, 2011 So , we went through this fitment stuff about the SASS bbl. & its not what we thought , its the fitment of the gas block on the barrel . They change the gas block dia. on the barrel to only fit there gas block ,brilliant !, Makes me want to buy one of there SASS bbl's. ,not ! Quote Link to comment Share on other sites More sharing options...
98Z5V Posted March 1, 2011 Report Share Posted March 1, 2011 When they first unveiled their SASS rifle, I saw alot of print about the special features. One of the things they touted was a "tapered gas block attachment." They don't pimp that so much anymore, but I still don't know what's "tapered" about it. I'd imagine that if the gas block inn er diameter has taper to it, the barrel would have to have that same taper to lock up tight. Drew, was there anything "tapered" about the setup you picked up, either on the barrel or gas block? Quote Link to comment Share on other sites More sharing options...
imschur Posted March 1, 2011 Report Share Posted March 1, 2011 I didnt measure. If there was a taper it wasnt visible Quote Link to comment Share on other sites More sharing options...
98Z5V Posted March 2, 2011 Report Share Posted March 2, 2011 Two or three thousandths (0.002~0.003") difference in the taper would do it, and that wouldn't be visible without some precision measuring tools. I've got all kinds of measuring devices, if you want to send that gas block to me. I'll whip up a detailed writeup with pics on the little monster. Quote Link to comment Share on other sites More sharing options...
imschur Posted March 2, 2011 Report Share Posted March 2, 2011 nah it's all assembled and in place under the vtac with loctited screws everywhere. Way to much effort for a procrastinator of my caliber. I could have measured had I thought of it. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted March 2, 2011 Report Share Posted March 2, 2011 Does anybody have one of these DPMS SASS gas blocks that would part with it for a week, so it could be measured out? Or, does anybody need one of these things, and they're willing to buy it from me - if I'd order one, measure it, then send it out to you? Either way will let me get the internal dimensions from the block. <thumbsup> Quote Link to comment Share on other sites More sharing options...
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