imschur Posted October 17, 2010 Report Share Posted October 17, 2010 Alright, I decided to get to the bottom of this once and for all.Here's a DPMS forum link and a Snipers Hide link describing the issue.Lets talk about it <munch> Quote Link to comment Share on other sites More sharing options...
imschur Posted October 17, 2010 Author Report Share Posted October 17, 2010 Now here is two images of whats supposed to be a PRI .936 and the SASS gas block. The SASS wall appears thicker which based on appearance would orient the gas tube higher.Do you guys see it the same way?Also I wonder if this also ties in to the new height of the upper receivers? Quote Link to comment Share on other sites More sharing options...
survivalshop Posted October 18, 2010 Report Share Posted October 18, 2010 They is no alteration to the gas tube passage in the upper ,just the rail height difference . For them to change the gas tube passage in the upper , you would have to also change or alter the carrier key. Any thing that DPMS does now would not surprise me . I am concerned with ,if they raised the gas tube height for it to fit into a higher then normal gas block to clear a higher than normal barrel , what kind of angle does the gas tube have going into the upper. Are they being bent to keep it aliened with the key? (that's if they didn't alter the normal spec's on the gas tube passage in the upper & carrier key)Or are they doing this just to keep there stuff ,there stuff . Another idea could be a piston system coming ? Conversions any one ? Quote Link to comment Share on other sites More sharing options...
imschur Posted October 19, 2010 Author Report Share Posted October 19, 2010 Well not that long ago they said they had zero interest in a piston gun. I'll they are trying to get more parts proprietary. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted October 19, 2010 Report Share Posted October 19, 2010 Here's what I'm thinking:The shoulder on the barrel us huge. Even if the gas block mounting area is .936, the step is pretty big. Does a "standard" .936 gas block have the gas tube hole covered partially by that big step? If so, that would explain why the DPMS-specific block has a larger wall thickness - both to get the gas tube up high enough to clear the step, and for asthetics (O.D. as large as the fluted portion of the barrel).SASS gas block:If the above is true, then it also requires a special gas tube with a different bend - like ss said up there, I'm betting they didn't go to the R&D trouble to relocate the hole in the upper, and change the gas key. However, also like ss said, anything they do know would come as no surprise at all. <dontknow> Quote Link to comment Share on other sites More sharing options...
motorwerks Posted October 24, 2010 Report Share Posted October 24, 2010 I would bet you could just bent the gas tube by hand if it didn't match up. Its only a 1/16th or so. Quote Link to comment Share on other sites More sharing options...
imschur Posted October 25, 2010 Author Report Share Posted October 25, 2010 Does anyone have a .936 gas block I can borrow for photographic purposes to illustrate the issue? Quote Link to comment Share on other sites More sharing options...
DocLarsen Posted November 1, 2010 Report Share Posted November 1, 2010 I am very interested in the outcome of this discussion; I am sitting on the fence trying to decide between a 18" SASS and a 24" fluted barrel. Has anyone come to actual bottom of this issue? If so, I'd really like to know!DocLarsen Quote Link to comment Share on other sites More sharing options...
imschur Posted November 1, 2010 Author Report Share Posted November 1, 2010 Without a doubt the barrel requires the DPMS proprietary gas block. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted November 1, 2010 Report Share Posted November 1, 2010 Is that because of the mounting height of the gas tube, at the gas block? Wall thickness of that DPMS SASS block, height-over-bore of the gas tube hole, which is higher than anything else with a .936 block...Which will also mean you need the DPMS SASS-specific gas tube with a different bend in it... <dontknow>I'm wondering if you can trench that barrel towards the shoulder, to accomodate a "standard" gas tube bend and "standard" .936 gas block? The gas tube would actually go down into the trenching, and right into the regular .936 gas block hole. All the crazy stuff I've seen on the 'net is about a "tapered" gas block - which would be a huge problem if you planned on fitting a "standard" .936 block. If it's just offset due to DPMS' idiotic proprietary thinking and movement, then that can be overcome with machining tools... ;D Quote Link to comment Share on other sites More sharing options...
98Z5V Posted November 1, 2010 Report Share Posted November 1, 2010 Drew, here's a YHM .936 lo-pro gas block, some kind of DPMS lo-pro .936 block, and a PRI .936 lo-pro block - I used the PRI on my .308 build, onto the Fulton SS barrel. Just from pics, I'd say focus on gas tube centerline over barrel centerline, just for the comparison. Best I can do from pics, brother... ;D Quote Link to comment Share on other sites More sharing options...
imschur Posted November 1, 2010 Author Report Share Posted November 1, 2010 Im going to buy the DPMS block this week. I would like to get a standard .936 block in hand to compare and publish the data with pictures Quote Link to comment Share on other sites More sharing options...
survivalshop Posted November 3, 2010 Report Share Posted November 3, 2010 Just by looks , it appears the gas tube hole in the sass gas block is twice as high as std . gas holes in std .936 blocks. That would mean the gas tube would be of a different configuration compared to a std gas tube.Reconfiguring a gas tube is not a big deal. They wanted a specific barrel configuration and made a different gas block & reconfigured ( bent ) a gas tube . The only thing here that is really of importance is the gas block change to make the gas tube come out higher to clear the barrel.That is unless the barrel extension flange is also higher than std. , then you would need some reconfiguring of the upper receiver gas tube opening (higher ) , which I don't think they did , because people are building with the newer rail height with no problems .They could have a special gas tube made up for that configuration also.Its just S/S tubing & you can bend them any way you want , with some restrictions of course. Quote Link to comment Share on other sites More sharing options...
imschur Posted November 3, 2010 Author Report Share Posted November 3, 2010 Long, thin and flexible, Ill bet the standard gas tube works without much issue. I checked the DPMS parts pages and there isnt a special tube listed.Cash permitting Im hoping to get a Fulton stripped upper by Xmas and put this all to rest. Quote Link to comment Share on other sites More sharing options...
DocLarsen Posted November 3, 2010 Report Share Posted November 3, 2010 I just pulled the trigger on a 18" SASS barrel and SASS Gas Block and the new SASS handguard. I am just shickled titless <lmao> and can't wait for it to arrive!! Should get here Friday or Saturday, Monday at the latest. I just couldn't see hasseling with something else; I had saved enough $$ in other places so that the $90 from JSE for the SASS gas block was doable and, with the new DPMS handguard, I'll have plenty of rail for my purposes.I'll be starting a build thread soon LOL ;D I went to the local gun shop/FFL yesterday and got to play with a couple of their ARs and have been bouncing around like a school girl ever since; couldn't wait to put my order in this morning.DocLarsen Quote Link to comment Share on other sites More sharing options...
imschur Posted November 3, 2010 Author Report Share Posted November 3, 2010 Thats the spirit!!! <thumbsup> Quote Link to comment Share on other sites More sharing options...
98Z5V Posted November 3, 2010 Report Share Posted November 3, 2010 Awesome news, Doc! You going with the upper and lower that I think you are? ;D Quote Link to comment Share on other sites More sharing options...
imschur Posted November 3, 2010 Author Report Share Posted November 3, 2010 BTW I think the JSE image for the SASS gas block is for the .750 version SASS and not the .936 Quote Link to comment Share on other sites More sharing options...
imschur Posted November 3, 2010 Author Report Share Posted November 3, 2010 Hey Doc any chance you can grab some dimensions for us? Quote Link to comment Share on other sites More sharing options...
DocLarsen Posted November 3, 2010 Report Share Posted November 3, 2010 imschur,JSE has both listed, the one for the mini SASS and the .936 for the .308 SASS. Luckily, for me, they are out of stock on the .750; otherwise, sure as shootin', I'd a got the wrong one :o.I'd be happy to get dimensions when the stuff gets here.DocLarsen Quote Link to comment Share on other sites More sharing options...
DocLarsen Posted November 8, 2010 Report Share Posted November 8, 2010 Finally got a chance to do some measurements on the 308 SASS Gas Block.DocLarsen Quote Link to comment Share on other sites More sharing options...
imschur Posted November 9, 2010 Author Report Share Posted November 9, 2010 Thanks Doc. Anybody have a standard .936 block around? Quote Link to comment Share on other sites More sharing options...
98Z5V Posted November 12, 2010 Report Share Posted November 12, 2010 My apologies, as mine is hidden under a 13.8" Troy rail, and it's securely packed up for a move right now. If the numbers don't come up by next weekend sometime, I'll be unpacked and be able to get some dimensions up here. <thumbsup>Lo-pro PRI .936 block on the Fulton barrel, standard rifle gas tube. Quote Link to comment Share on other sites More sharing options...
thrillhouse700 Posted December 31, 2010 Report Share Posted December 31, 2010 Hey guys! New here and on my first lr308 via Ma-Ten. SASS was my barrel of choice then saw this thread so thanks for all the info. So if I still go this route will this setup fit under a jp Vtac forearm? Quote Link to comment Share on other sites More sharing options...
imschur Posted December 31, 2010 Author Report Share Posted December 31, 2010 I have both parts on order and will know shortly. Quote Link to comment Share on other sites More sharing options...
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