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Thread: Oh No I bought a RRA.....Did I fix it right?

  1. #21
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    Well depending on whats is available I have bought Monarch 55grain .556 from academy, and have bout 2 cases of .556 m193. The cases are waiting for a Magpul Dynamics Class in October so I guess I ought to run a few mags of those to make sure its going to feed/fire. When reading about receiver extentions on the AR Technical Discussion Knowledge Based Threads I believe that I read that the milspec has a different thread then the commerical ones, if that is true will a milspec fit on my commerical receiver?

    Matt

  2. #22
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    Quote Originally Posted by C4IGrant View Post
    Yes IMHO. Reason? The commercial RE's are 6061 and the mil-spec is 7075. So at the VERY least, they are stronger. This mostly applies to buttstroking or drop testing.

    The main reason I would switch it out is because they are "glued" together vs being staked.

    I have had to remove RE's on the range before in order to get a gun back up and running. That is not going to happen with a loctited castle nut.

    The other side benefit is that you have more options for stocks.



    C4
    Ah, thanks C4, good points! Think I'll stay put with my commercial RE but won't loctite it yet, just in case...

  3. #23
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    Updated with Range info

    Alright guys for those following this thread I appreciate all the input thus far in this thread, and the information been relayed to me. So I got my chance to take it to the range today. My plan was not to work on drills/technique ect...but I did make sure I used my fundementals cause no round is wasted right. I loaded up 99 rounds of ammo, I planed to shoot 100 rounds but mis loaded one of my mags. Out of the 99 rounds I fired 98 rounds, I had one Fail to Feed problem. Immediate action and I was back in the fight. The main concern I have is not so much at first but the last 40 rounds I fired were out of 3 different mags and the bolt did not lock back when the last round was fired on all three mags. In my limited wisdom I think that using the extra power spring has caused a bit of short stroking and this may be the reason for the fail to feed and the failure to lock back upon firing the final round. I had no problems with performance minus what has been explained and all in all without the fail to feed and fail to lock back x3 the new bcg/buffer/and spring ran fine. But I guess to say that is to accept that that it may/will happen when I need my rifle so that in and of its self is not acceptable. I know that rifles are machines and mechanical instruments and will all fail...but until it reaches failure I need it to run as close to 100% as it can. Especialy under favorable conditions. I think being new to the AR paltform, 3 years owning and shooting, has possibly caused some "rookie" mistakes in trying to tinker with it and make it better thus leading to the range problems I had today.

    Questions and my options:
    1) I'm thinking of keeping the extra power spring to use as a back up only with my origional bcg and car buffer and purchasing a standard spring to use with the new bcg and buffer. The good, bad and ungly of this? (questions/comments/gripes concerns)

    2) Also while speaking of the old bcg while browsing the BCM website I found the BCM Sopmod bolt upgrade/rebuild kit, the BCM extractor spring upgrade, and the BCM extractor spring upgrade kit (set of 3). It was mentioned earlier in this thread that buying a bolt upgrade kit would be a good option. So which one is it? I'd assume the Sopmod upgrade/rebuild kit but then again I'm just assuming.

    3) Could the extra power spring be causing the fail to feed and fail to lock back due to short stroking? I should add that I was using 3 usgi mags with Magpul ranger floor plates and it was the first time I have shot them since adding the floor plates but have not had issues with them in the past. Am I correct in diagnosing the problem or is there potential for other factors to cause this?


    Thanks again guys,
    Matt

  4. #24
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    Quote Originally Posted by C4IGrant View Post
    If I owned a RRA, there is the list of things I would do:

    1. Stake the gas key.
    2. Add a BCM bolt upgrade kit (if it has a carbine gas system).
    3. Buy a spare bolt (as these break on all guns).
    4. Add an H buffer for a middy gas system and an H2 or H3 buffer for a carbine gas system.
    5. Check the chamber to make sure it is 556 NATO.
    6. Removed the RE and installed a mil-spec one and then staked the castle nut.
    C4
    BTW, I trying to apply these suggestions and not waste any more money.

    1) Stake the gas key:
    As of the current I have two BCG's the Anvil Arms and RRA. While the Anvil is properly staked compared to the pics of staking posted on M4C the RRA which has been staked in the past is not quite up to snuff. The staking does not quite carry over from the gas key material to the screws and I'm working on finding someone to stake it for me.

    2) Add a BCM bolt upgrade kit
    As stated in my last post....which one? The Sopmod upgrade/rebuild or just the upgrade kit?

    3) Buy a spare bolt
    I currently have 2 complete BCG's that both function right now. I know the movotation behind my op is to gain some check marks on the list and upgrade my rifle. So I plan on implementing #2 above on the RRA bolt, and saving for another quality bolt if not complete BCG.....maybe BCM or LMT who knows.

    4) Add an H buffer for a middy gas system and an H2 or H3 buffer for a carbine gas system
    I think it has been determined that I have a carbine gas system so I've got the ST-T2 buffer which seemed to function well today at the range so I think I'll hang on to it.

    5) Check the chamber to make sure it is 556 NATO
    Not too sure how to check the chamber minus reading the markings.....any ideas?

    6) Remove the RE and installed a mil-spec one and then staked the castle nut.
    As soon as I can verify that if I buy a mil-spec RE it will work (threads are the same) I'll be doing this and maybe if I get lucky I'll find a smith who can install and stake the RE and castle nut. But who will also be able to check my chamber and properly stake my gas key.


    I now have a plan

    Matt

  5. #25
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    Quote Originally Posted by Matt2124 View Post

    6) Remove the RE and installed a mil-spec one and then staked the castle nut.
    As soon as I can verify that if I buy a mil-spec RE it will work (threads are the same) I'll be doing this and maybe if I get lucky I'll find a smith who can install and stake the RE and castle nut. But who will also be able to check my chamber and properly stake my gas key.


    I now have a plan

    Matt
    Threading has little to do with the difference between mil-spec and commercial tubes, lower receivers do not have commercial or mil-spec specific threads, they accept both styles.

    Do a search for "quib and stake" he has a good DIY with pics. You'll need a gunsmith with a 5.56 chamber reamer to check that chamber.

  6. #26
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    read up and enjoy

    http://m4carbine.net/showthread.php?t=7009

    there is a receiver extension basics thread in there.

  7. #27
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    Quote Originally Posted by spamsammich View Post
    read up and enjoy

    http://m4carbine.net/showthread.php?t=7009

    there is a receiver extension basics thread in there.

    Thanks bro, I read the "buffer tube basics" the other day maybe yesterday or two days ago when it was recommended that I go to a mil-spec RE but I thought I read in there that the threads on a mil-spec vs. non mil-spec were different sizes. I'll read it again shortly to verify.

    Thanks again
    Matt

  8. #28
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    They are the same thread pitch, outer diameter of the thread is different because commercial tubes have a thread diameter that is the same as the main part of the tube and thus aren't typically full height. Milspec threads are taller, but the same pitch.

  9. #29
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    Ok it all is starting to make sense now thanks for clearing that up for me


    Matt

  10. #30
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    .....The threads are the same and they will fit your lower. I have a RRA lower that I initially built with a commercial RE I had laying around, I've since replaced it with a milspec RE.
    Last edited by Rider79; 09-11-09 at 07:21. Reason: incorrect info
    "It makes no difference what men think of war, said the judge. War endures. As well ask men what they think of stone. War was always here. Before man was, war waited for him. The ultimate trade awaiting its ultimate practitioner."

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