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- Lastly, don't forget the <b>Buyer/Seller Feedback section</b>

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The 7.5 lb. A2

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  • #31
    Originally posted by mac1911 View Post
    It took a little work, cost me nothing but time.
    1. Took some weight off the fat barrel ( this barrel is nothing special and seen some rounds especially the cheap stuff)

    2. Lost the annoying brake and some barrel--ended up with almost 3" of barrel loss

    4. Changed out to a free float tube. Its about a wash for the A2 guards I had on there.
    5. Re crown 11' crown I went a little deeper to leave just a slight "ring" (blue) then polished it up

    quick test 100 yards benched, lunch time rushed method!
    left PPU m193 Right 24 grains varget 69gn Nosler CC.

    so if I make it to VT games I should be good to go

    I will bring the hack saw and cut that last available inch off if needed!

    after that I will SBR tax stamp it!


    • #32
      My AR with a WW Government Profile A4 upper came in at 7 lb. 9.7 oz. Two quick fixes:

      1. I ordered a lighter pair of handguards from RRA. A pair weighs 8.8 oz., which cut off about 0.7 oz. of weight from the handguards that came installed on the upper.

      2. I swapped out the knobs on the carry handle with 10-32 stainless steel lock nuts.

      Total weight after these mods: 7 lb. 7.8 oz.


      • #33
        I know this is an old thread, but I’m just circling back on this. For these government profile barrels, which is the way to go, 1:7 or 1:9 twist?


        • #34
          Well: I'm trusting that you are not related to Jen Psaki.... As for the barrels: possibly interesting story.... I built two 7.5# ARs for CMP MM class, both with A2 length and weight barrels 7" twist--but not the same manufacturer (could only get one from each supplier at the time). See previous posts in this thread. Both rifles shot fine, easily holding the ten ring. However, my friend experienced occasional fliers and "disappearing" bullets with his rifle. No problems with mine--different barrel. After testing (there is a thread on this forum somewhere), we determined the problem was the bullets were not holding up to the speed and rotation (new barrel with sharp rifling, etc...). Mil spec 55gr open base were OK and slowing down the match hollow points also ended the problems. I don't think this is a common problem, but you may want to consider this matter some. Since the MM match is 100 or 200yards, you can use a 55gr FMJBT or slow down any match bullet, use (almost) any barrel and still have enough accuracy that your offhand will determine outcome. Good Shooting. ...


          • #35
            Originally posted by ceresco View Post
            Well: I'm trusting that you are not related to Jen Psaki.... As for the barrels: possibly interesting story.... I built two 7.5# ARs for CMP MM class, both with A2 length and weight barrels 7" twist--but not the same manufacturer (could only get one from each supplier at the time). See previous posts in this thread… Good Shooting. ...
            Nice - I had to look that one up, and no relation or affiliation. I have read through some of the threads you mention. The main intent for my build will be for modern military; however, I will likely shoot across the course every now and again, although I understand I will be out-gunned by the purpose-built service rifles.


            • #36
              I think you have it all figured out. Good Shooting. ....


              • #37
                Am I reading the rules correctly that one can use a sub-moa rear sight but not a hooded aperture?


                • #38
                  We have been using hooded apertures, 1/4 min and pinned --our uppers came right off NRA service rifles when everyone switched to scopes. Good Shooting. ...


                  • #39
                    I reckon worst case scenario is I buy a 1/2-moa NM rear sight and use a standard A2 aperture if need be.


                    • #40
                      I just re-read the rules, on p. 47, under 5.2.3, c) it says “Rifles must be equipped with issue-type metallic front and rear sights…” My red-faced-test interpretation is no hooded aperture the more I think about it.


                      • #41
                        Originally posted by GarandThumb21 View Post
                        I am at 7 lbs 9.7 oz with my Windham govt profile A4 upper and my RRA lower, according to my digital postal scale. I have a RRA chrome BCG. The RRA lower has the standard A2 stock and grip. Without more extreme measures such as swapping out the buffer tube etc, I could acquire a lighter BCG, or possibly remove the nuts on my A4 carrying handle in order to make weight. Any practical experience with the latter?
                        I started with an A2 iron sight rifle, standard handguards, that was fully in compliance with MM rules. Rules changed to allow scopes, so with some work I was able to make the new weight with the scope. Age & eyes made using the scope a no-brainer.

                        The latest rules change, allowing free-float but dropping the weight to 7.5 was challenging to meet with my current set up and a lightweight free float tube. One of the simplest things I did was remove those huge steel knobs from the carry handle and replace them with small nylock nuts. the bolt ends stuck out, but I covered those with the little vinyl protectors one can find at the hardware store. This has passed muster at several CMP games events and Perry as well. Guess I could have saved more weight with a lighter BCG, but that costs just a little more than a couple nylocks. ;-)


                        • #42
                          Originally posted by martindc1 View Post
                          I just re-read the rules, on p. 47, under 5.2.3, c) it says “Rifles must be equipped with issue-type metallic front and rear sights…” My red-faced-test interpretation is no hooded aperture the more I think about it.
                          The phrase "issue-type metallic....." is not specific enough to mean no hood--maybe.... Seeing a pic of a short barrel and standard handguard on a supposedly (MM) legal rifle is confusing, but that is the situation today. Might mention another issue. At inspection, an AR is presented, but the matches it will be used in are not mentioned. I have seen (not recently) a NM rifle that "passed inspection" (maybe for the EIC match) then used in the MM match without being flagged. With the regional games now including many service rifle matches, this sort of thing can easily lead to confusion. Good Shooting. ....


                          • #43
                            Originally posted by ceresco View Post
                            The phrase "issue-type metallic....." is not specific enough to mean no hood--maybe.... Seeing a pic of a short barrel and standard handguard on a supposedly (MM) legal rifle is confusing, but that is the situation today. Might mention another issue. At inspection, an AR is presented, but the matches it will be used in are not mentioned. I have seen (not recently) a NM rifle that "passed inspection" (maybe for the EIC match) then used in the MM match without being flagged. With the regional games now including many service rifle matches, this sort of thing can easily lead to confusion. Good Shooting. ....
                            When I get my MM inspected they mark on the MM scorecard the last 4 digits of the SN. Our full blown SR's can be shot in UNlimited MM but not regular MM. BUT....I know of a few times that tricked out SR's were shot in the regular MM match. It was a mistake at the inspection table but the shooter felt like it was ok because the inspector made the mistake. Knowingly doing this is akin to cheating. I lost a lot of respect for that guy that day. I still outshot him (and won the match) with my iron sighted 16" MM. Hardest part for me was to get below the 7.5# max.

                            I made it clear to him that his decision showed me that his integrity was only worth the price of a 1.50 medal. Pitiful....

                            OK....I'm off the soapbox.

                            I can shoot a one hole/one shot group at any distance....."If I do my part"
                            Keith Schachle
                            Distinguished Rifleman Badge #2287
                            Presidents Hundred (Top 20 Shootoff)
                            NRA XTC Service Rifle- High Master
                            NRA Midrange - High Master
                            CMP XTC Service Rifle - High Master
                            CMP Master Instructor
                            Almost Perfect Attendance in the 3rd grade


                            • #44
                              I have a few A2 clones and Colt Sporters with a GI profile bbl they all weigh around 7lbs even well under 7.5 limit.

                              Having been a long time HP shooter and shoot A2 clones regularly for 200 yd offhand and sitting RF practice they are all capable of cleaning a SR2 target with ball ammo ( M193 or 855 ). FF Tube really isnt needed to have a MM competitive rifle, for games match at 200 yds it is more Indian than Arrow and you need to shoot a good offhand and have solid prone skills.

                              A2 clone with stock or 1/2 x 1/2 rear good 4.5 lb match trigger and ammo. If you dont get a Gold it isn't the rifles fault.


                              • #45
                                While shooting AR15s in MM is primarily an offhand competition, a standard issue rifle is going to give up Xs and points to a free floated rifle and military ammo will hurt your score as well. You need to go into offhand with 200 points and as many Xs as possible. Match ammo and a rifle accurized within the rules will definately help. The sling tension issue is big.. Good Shooting.....