308reloaded Posted March 24, 2011 Report Share Posted March 24, 2011 what size roll pin goes in the dpms 4 rail gas block.? 1/16Th? the pin I have measures .097in. dia. 1/2" longhaving hell of a time getting started. next size smaller that I have falls through Quote Link to comment Share on other sites More sharing options...
Matt.Cross Posted March 24, 2011 Report Share Posted March 24, 2011 This sounds like a good question for 98Z5V, he's an EXPERT on gas block roll pins, and he would be the first to warn you that loose gas block pins can grow a whole rifle like a dead tree grows mushrooms... SO BE CAREFUL! Quote Link to comment Share on other sites More sharing options...
308reloaded Posted March 25, 2011 Author Report Share Posted March 25, 2011 I have heard the same thing.I have 3/32 roll pin to try tonight after work. plus a homemade roll pin installment tool. just a rod with hole drilled on end....drilled next drill size bigger than roll pin made 1 for 1/16 and 1/8 roll pins also.roll pin fits in the end, no wobble or falling out. or miss, and I rounded outside edges so not to hit anything and leave mark on gas block or what ever I use these for. could someone tell me the correct size. i make enough mistakes as it is.. it looks like gas block takes bigger than gas tube Quote Link to comment Share on other sites More sharing options...
imschur Posted March 25, 2011 Report Share Posted March 25, 2011 They are difficult. Here's what I do.1. Get a roll pin punch of the correct size. I prefer the ones with the radius.2. I then take a piece of 1" wide masking tape and wrap it around the punch while overlapping half of the pin. Probably 3 or 4 wraps3. Hammer the bitch in. The tape holds it in line but is no match for the hammerAlternatively I have done the same thing with the clear heat shrink tubing. Quote Link to comment Share on other sites More sharing options...
imschur Posted March 25, 2011 Report Share Posted March 25, 2011 BTW Im missing fingers so it should be easier for you fully digited folks <lmao> Quote Link to comment Share on other sites More sharing options...
98Z5V Posted March 25, 2011 Report Share Posted March 25, 2011 Same as the AR-15 pin. It's about 1/12th of an inch. Hit this for exact dimensions:http://www.biggerhammer.net/ar15/pins.html Quote Link to comment Share on other sites More sharing options...
survivalshop Posted March 25, 2011 Report Share Posted March 25, 2011 It can help to radius or taper the front of the pin or the end you are trying to insert.Put the pin in a drill press or battery operated drill & dress it at about a 45 deg. angle or so with a file or stone ,just a little to give it a start into the hole . If you look close at a pin ,it has a little roundness to it already for this . Quote Link to comment Share on other sites More sharing options...
308reloaded Posted March 25, 2011 Author Report Share Posted March 25, 2011 Same as the AR-15 pin. It's about 1/12th of an inch. Hit this for exact dimensions:http://www.biggerhammer.net/ar15/pins.html thank you .now I know I'm using correct sizeI have saved that site. lots of info that I dont always remember Quote Link to comment Share on other sites More sharing options...
SWshooter Posted March 29, 2011 Report Share Posted March 29, 2011 I think 98Z5V is the tactical roll pin moderator on this site, isn't that true Drew? Quote Link to comment Share on other sites More sharing options...
imschur Posted March 29, 2011 Report Share Posted March 29, 2011 <thumbsup> Quote Link to comment Share on other sites More sharing options...
98Z5V Posted March 29, 2011 Report Share Posted March 29, 2011 It's probably something I wish I didn't learn... <lmao>Those roll pins are dangerous items to keep hanging around. I'm just sayin'... :o <laughs> Quote Link to comment Share on other sites More sharing options...
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