bubbas4570 Posted February 20, 2018 Report Share Posted February 20, 2018 I have been pondering something before I actually do it. I need to remove my F marked A-frame gas block in order to make clearance for my scout style mounted scope now.....and I am having a hard timemaking sure I do this the best way. Long story's short, my A-frame gas block is pinned, and I do have a set screw style gas block on hand, but am worried about getting it "set" correctly with the set screws. I am inclined to think that a pin style gas block would still be a better option. This would be more rugged, less prone to failure, then just getting or finding another pinned front sight block,. another option would be to take a grinder or cutting disc to my current front sight gas block and make it work for me. One final option is to purchase on of those preground type of gas blocks that look like an A-frame ground down. Thoughts or opinions from those who know more and have done it before, please. Quote Link to comment Share on other sites More sharing options...
guruofhotrod Posted February 20, 2018 Report Share Posted February 20, 2018 Another option would be a clamp on style gas block like this: http://www.primaryarms.com/vltor-low-profile-gas-block-750-clamp-style-gb-2c-b Quote Link to comment Share on other sites More sharing options...
bubbas4570 Posted February 20, 2018 Author Report Share Posted February 20, 2018 I was thinking about I was thinking about clamp-on, but how important is it to get it absolutely straight down the Gas ports on those barrels? I just want to make sure it stays completely 100% functional all the time, as it is right now. Quote Link to comment Share on other sites More sharing options...
Robocop1051 Posted February 20, 2018 Report Share Posted February 20, 2018 The port inside the gas block is generally .120-.125 in diameter. The Gasport on your barrel is generally .07-.09 In diameter. So you can see, there is a lot of room to play with alignment. It’s kind a like covering a golf ball with the bucket. Quote Link to comment Share on other sites More sharing options...
COBrien Posted February 20, 2018 Report Share Posted February 20, 2018 (edited) Buy these: https://hbindustries.net/store/shop/ar15-gas-block-aligner-7-62mm/ and never worry about block-to-port alignment again. Also available in 5.56. This video sold me on them: Edited February 20, 2018 by COBrien Added video. Quote Link to comment Share on other sites More sharing options...
bubbas4570 Posted February 20, 2018 Author Report Share Posted February 20, 2018 Those look like they work! Thanks, COBrian. Quote Link to comment Share on other sites More sharing options...
bubbas4570 Posted February 20, 2018 Author Report Share Posted February 20, 2018 Next question, any difference between a clamp on or set screw block for reliability? ...not getting knocked out of alignment, staying set, etcetera. ...... In my mind the clamp on version would be best, but I have been wrong before..... Quote Link to comment Share on other sites More sharing options...
jtallen83 Posted February 21, 2018 Report Share Posted February 21, 2018 1 hour ago, bubbas4570 said: any difference between a clamp on or set screw block for reliability? In theory the set screw used in barrel dimples would be more secure from turning but I have not had an issue with either. The Geissele block has set screws and then a hole so it can be pinned to the barrel. Quote Link to comment Share on other sites More sharing options...
survivalshop Posted February 21, 2018 Report Share Posted February 21, 2018 I use only Clamp on GB's & some have been on for ten plus years & no issues , they both work if installed correctly . That Pin thingy is a great idea , but I have done so many , its second nature to align them . Quote Link to comment Share on other sites More sharing options...
bubbas4570 Posted February 21, 2018 Author Report Share Posted February 21, 2018 I have taken mine off 3 times, but when they are pinned there isn't much guesswork involved. Quote Link to comment Share on other sites More sharing options...
jtallen83 Posted February 21, 2018 Report Share Posted February 21, 2018 37 minutes ago, survivalshop said: That Pin thingy is a great idea , but I have done so many , its second nature to align them . I always thought the pin was there to stop any movement from abuse, not for alignment? Those big old A2 front sights would get the crap knocked out of them and never budge a bit. Eventually my Geissele block will get pinned when it comes to rest on the right build. Quote Link to comment Share on other sites More sharing options...
bubbas4570 Posted February 21, 2018 Author Report Share Posted February 21, 2018 Maybe I should just remove the tower then....it fits, works, and is solid as a shyt brick house. Cut, shape, and some paint...all done. Looks not important to me. Quote Link to comment Share on other sites More sharing options...
bubbas4570 Posted February 21, 2018 Author Report Share Posted February 21, 2018 Maybe I should just remove the tower then....it fits, works, and is solid as a shyt brick house. Cut, shape, and some paint...all done. Looks ARE not important to me. Reposted to clarify what is important. Quote Link to comment Share on other sites More sharing options...
sketch Posted February 21, 2018 Report Share Posted February 21, 2018 i have two cut down type pinned gb's, its a close shave but work as the day they were installed. robo's dremmel tool guided me. i had picks here a few years ago? Quote Link to comment Share on other sites More sharing options...
survivalshop Posted February 21, 2018 Report Share Posted February 21, 2018 9 hours ago, jtallen83 said: I always thought the pin was there to stop any movement from abuse, not for alignment? Those big old A2 front sights would get the crap knocked out of them and never budge a bit. Eventually my Geissele block will get pinned when it comes to rest on the right build. I was referring to those break away alignment pins for setting up the GB . Pinned A2 sight types are the most secure of all GB's & the Geissle is also right up there . There is data that any pinned or pressure on the Barre ( especially light weight bbl's. ) can effect the inside of the Barrel , slight bulging & could effect accuracy , though I don't believe it would be much for a Combat or Defensive weapon , but them Match guys think of everything . Its why I use only Clamp on Gas Blocks , but not for match shooting , I just believe they surround the Barrel & evenly distribute clamping pressure around the circumference of the Barrel , instead of one or two pin points . Quote Link to comment Share on other sites More sharing options...
COBrien Posted February 21, 2018 Report Share Posted February 21, 2018 16 hours ago, bubbas4570 said: Those look like they work! Thanks, COBrian. No problem! I stumbled upon them a couple months ago. Having said that, I don't know that it's quite as simple as the guy in the video makes it out to be. As mentioned above, given the various gas port sizes used, most gas blocks have a much larger opening. I'd recommend moving the gas block one direction (i.e., to the left) until it stops on the pin, then the other direction until it stops on the pin, then split the difference and torque it down. Then you'd be perfectly centered. Quote Link to comment Share on other sites More sharing options...
bubbas4570 Posted February 21, 2018 Author Report Share Posted February 21, 2018 I will keep that centering idea in mind if I put a new one one mycarbine. Quote Link to comment Share on other sites More sharing options...
bubbas4570 Posted February 21, 2018 Author Report Share Posted February 21, 2018 For the moment, is there a link for Robo's cutoff instructions? Not that I can't do it, but once in a while there is a small trick that makes all the difference.....you guys know what I mean. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted February 22, 2018 Report Share Posted February 22, 2018 It's pretty straightforward. I don't know if either one of these will be any good, but it's worth a look... Quote Link to comment Share on other sites More sharing options...
sketch Posted February 22, 2018 Report Share Posted February 22, 2018 thats about all i studied ^^ robo is just a dremel pimp? Quote Link to comment Share on other sites More sharing options...
bubbas4570 Posted February 22, 2018 Author Report Share Posted February 22, 2018 That is about what I figured it would take. Those two guys went farther and took off the bayo lug and swivel, but mind is outside of the handguard so that isn't really needed. I was actually even thinking about doing "on the gun", but will remove it to get a better finished product. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted February 22, 2018 Report Share Posted February 22, 2018 Watch those taper pins. They're FUN!!! Quote Link to comment Share on other sites More sharing options...
sketch Posted February 22, 2018 Report Share Posted February 22, 2018 get a bigger hammer! i mean that! Quote Link to comment Share on other sites More sharing options...
bubbas4570 Posted February 23, 2018 Author Report Share Posted February 23, 2018 21 hours ago, 98Z5V said: Watch those taper pins. They're FUN!!! Yuppers, I have had this off more than once already....twice in one project, just because I pulled dumbass out of my pocket... Quote Link to comment Share on other sites More sharing options...
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