ellie_18 Posted July 21, 2010 Report Share Posted July 21, 2010 Hello, I own the m4 ops model but I'm considering a purchase of the m16 spr version but that decision depends on one mod. Does any know for sure if I can install a magpul PRS stock on that rifle or any of the Umarex/Colt designs? Quote Link to comment Share on other sites More sharing options...
techmike Posted July 21, 2010 Report Share Posted July 21, 2010 Hey ellie_18, and welcome to the site. The Colt/Umarex's "buffer tube" measures 28.75 mm in diameter. My Sabre Defense AR's buffer tube measures 30.20 mm in diameter. Every stock I have tried on the Colt fit's, but is a sloppy fit. What I have done with success is to use an adhesive, (single side), teflon tape as shim stock inside the stock. I place it lengthwise at 9, 12 and 3 o'clock positions, and that works for me. TM Quote Link to comment Share on other sites More sharing options...
rodent.22 Posted July 21, 2010 Report Share Posted July 21, 2010 yeah I also modded my stock to remove some slop. I've seen numerous photos online of the Colts with Magpul stocks, military spec installed. Quote Link to comment Share on other sites More sharing options...
ellie_18 Posted July 24, 2010 Author Report Share Posted July 24, 2010 Thanks for the info guys but the SPR has an a2 buttstock. I don't know if it uses the same buffer tube as the Umarex m4. The milspec A2 buffer tubes are completetly cylindrical and the magpul PRS is a fixed stock that Requires an a2 buffer tube. Thanks again Quote Link to comment Share on other sites More sharing options...
rodent.22 Posted August 23, 2010 Report Share Posted August 23, 2010 The colt/umarex buffer tubes are proprietary, you would have to get a Walther m4 tube and install it, then the adjustable replacement stocks would work. The Colt/Umarex/Walther tube is NOT hollow on the reciever end, this being a blowback design. The tube end is solid, and is actually attached to the gun with a screw, the tube nut not actually holding the tube to the gun. :beer: Quote Link to comment Share on other sites More sharing options...
rodent.22 Posted August 23, 2010 Report Share Posted August 23, 2010 I finally realizied what you were getting at. NO an A2 type stock won't fit on my OPS. It must have an M4 type stock. The M16 versions with an A2 stock would have to have an A2 style replacement. Quote Link to comment Share on other sites More sharing options...
ellie_18 Posted August 23, 2010 Author Report Share Posted August 23, 2010 Thanks rodent.22, the colt m16 wont work either as it has no tube at all my local dealer disassembled one for me so I opted for the ruger sr22 instead but i really like the m16 spr and brownells has an awsome but expensive stock with a built in folding monopod and adjustable cheek peace so I may still pick one up. Quote Link to comment Share on other sites More sharing options...
rodent.22 Posted August 23, 2010 Report Share Posted August 23, 2010 These blasted things are driving me crazy... :bang: Quote Link to comment Share on other sites More sharing options...
atomichead Posted May 6, 2011 Report Share Posted May 6, 2011 New to Tactical22 after purchasing an M4 Ops. I've been having a blast modding and shooting but one thing bothers me a bit and that's the sloppiness of the stock. I'm sure there a a whole bunch of ways to reduce the play but can I ask what some of you did specifically? Quote Link to comment Share on other sites More sharing options...
techmike Posted May 6, 2011 Report Share Posted May 6, 2011 Welcome to Tac.22. I used teflon tape - it is black, about .0015" thick and has adhesive on one side - I put some inside the stock and it tightened up the fit. Quote Link to comment Share on other sites More sharing options...
atomichead Posted May 8, 2011 Report Share Posted May 8, 2011 Okay, I'll give that a go. Thanks Mike. Quote Link to comment Share on other sites More sharing options...
shweller Posted April 7, 2012 Report Share Posted April 7, 2012 I have an SPR am not happy with the A2 stock and would love to install a collapsible one. Does anyone have any parts or part numbers regarding the parts I will need to do a conversion to the M4 style butt stock? Any information would be greatly appreciated. Does anyone have an original M4 stock laying around that they would be willing to part with? :confused: Quote Link to comment Share on other sites More sharing options...
techmike Posted April 11, 2012 Report Share Posted April 11, 2012 I don't know. Have never handled the M16 version. The parts list is not helpful, except that it shows two different part numbers for the lower - an M4 and a M16. So am guessing they made them so you are not able to put the collapsable stock on a M16. Quote Link to comment Share on other sites More sharing options...
shweller Posted April 13, 2012 Report Share Posted April 13, 2012 Seems to be looking that way... Thanks for looking into it. I agree the parts diagram is no help at all. It's very generic and not model specific. Quote Link to comment Share on other sites More sharing options...
minos36 Posted June 20, 2012 Report Share Posted June 20, 2012 Welcome to Tac.22. I used teflon tape - it is black, about .0015" thick and has adhesive on one side - I put some inside the stock and it tightened up the fit.techmike, if you don't mind me asking - what kind of adhesive teflon tape did you use and where did you buy it? Quote Link to comment Share on other sites More sharing options...
techmike Posted June 20, 2012 Report Share Posted June 20, 2012 Well, I don't know. I pick up a lot of junk, ah, good stuff, at garage sales, and I think this was in a box-o-stuff. It is .010" thick after removing the backer, 3/4" wide, black in color and absolutely no markings at all. I think it is similar to 7746A31, which can be found at http://www.mcmaster.com/#. Copy & paste 7746A31 into their search field and click find. Hope that helps,TM Quote Link to comment Share on other sites More sharing options...
minos36 Posted June 20, 2012 Report Share Posted June 20, 2012 oh cool, thank you very much! was considering this CS Hyde Teflon Mouse Tape from amazon before you responded. Quote Link to comment Share on other sites More sharing options...
techmike Posted June 20, 2012 Report Share Posted June 20, 2012 That would probably work fine - but I didn't see a thickness. I think I had to stack a few pieces of the .010" stuff to get it the way I wanted it. Good luck & let us know how it works out!TM Quote Link to comment Share on other sites More sharing options...
minos36 Posted June 20, 2012 Report Share Posted June 20, 2012 alright, i went ahead and ordered the teflon mouse tape since it's less expensive than the mcmaster antistatic UHMW polyethylene tape. (amazon prime shipping too, heh). i'll try it out and report back. perhaps it'll be a great solution for the budget-minded. Quote Link to comment Share on other sites More sharing options...
techmike Posted June 20, 2012 Report Share Posted June 20, 2012 :thumb: Quote Link to comment Share on other sites More sharing options...
minos36 Posted June 25, 2012 Report Share Posted June 25, 2012 the teflon mouse tape works great! i have no way of measuring the thickness of it but it looks pretty thin. thin enough for it to be translucent when working in a well-lit room. i went ahead and placed two layers (long strips) of the tape on the inside of the stock at the 12 o'clock, 3 o'clock, and 9 o'clock positions. did a test fit and noticed there was still a little play coming from the bottom channel of the stock, where the retention pin locks the stock into the 4 positions of the tube. so i went ahead and placed one layer of teflon tape just to the sidewall of the lower channel of the stock (to avoid messing with the retention pin), and did another test fit. worked great! absolutely no left-right wobble and slides really smooth. there is still a little front-back wobble, probably due to a small gap where the retention pin locks into the tube... but i'm ok with that.over all, VERY pleased with this inexpensive fix for the stock collapsible stock. this will hold me over for awhile before getting a magpul. hahathanks, again, for your help and suggestions, TM! time to go shoot. Quote Link to comment Share on other sites More sharing options...
SteelAvalanche Posted June 5, 2013 Report Share Posted June 5, 2013 SPRs require an airsoft aeg buffer tube adapter included with most Magpul PTS stocks. And easily added from my experience. I added the PRS to my SPR and a UBR to my OPS no problem at all. Quote Link to comment Share on other sites More sharing options...
techmike Posted June 5, 2013 Report Share Posted June 5, 2013 That is some mean looking hardware ya got there! :thumb: Quote Link to comment Share on other sites More sharing options...
SteelAvalanche Posted June 7, 2013 Report Share Posted June 7, 2013 Yeah I wish I could find another SPR or a M16 carbine (I stalk Gunbrokers & Armslist everday for one) to do another build....Let's just say with a 37mm flare launcher and watching a "Scarface" a couple times.... I'm sure I could whip up another "Little Friend". Lol Quote Link to comment Share on other sites More sharing options...
SteelAvalanche Posted June 7, 2013 Report Share Posted June 7, 2013 ....Plus the OPS will be geting a facelift soon.... Quote Link to comment Share on other sites More sharing options...
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