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Thread: one-piece gas rings and M4A1

  1. #51
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    I recieved my McFarland rings from G&R and they fit much more snug, more like my BCM. I couldn't believe the difference in fit between them though on visual inspection nothing could be seen different. Thanks again for a helpful thread!!

  2. #52
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    Quote Originally Posted by danish View Post
    I recieved my McFarland rings from G&R and they fit much more snug, more like my BCM. I couldn't believe the difference in fit between them though on visual inspection nothing could be seen different. Thanks again for a helpful thread!!
    In my experience the difference in parts as a general rule,is that buying from a dealer like GRT that hand selects and sells parts of known quality and source,is a major advantage...which is becoming rather scarce.
    Then there is the simple fact that Grant flat out knows what he is doing,is a active shooter and uses what he sells unlike the distributors/suppliers who purchase in bulk and sells the parts that they have no idea about in most cases.
    So if there is an issue with a part Im pretty sure Grant will catch it rather fast and it will not be sold.
    Thats why I buy from GRT and refer folks to them every chance I get.

    As far as the gas rings,like I said earlier there are a few lower end McFarland style rings floating around,which is probably why so many folks have issues and the one piece rings in general have such a varying reputation.
    .Just gota buy from a known source.
    Glock Certified Armorer
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  3. #53
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    When everything else fails, read the manual:

    ARMY TM 9-1005-319-23&P
    AIR FORCE TO 11W3-5-5-42

    “Check for worn or missing bolt rings. Check for proper staggering of bolt rings. Insert the bolt assembly into the key and bolt carrier assembly. Turn key and bolt carrier assembly so the bolt assembly points down. The bolt assembly must not drop out. Remove bolt assembly. Check for broken or missing firing pin retaining pin and bolt cam pin; replace as necessary.”

  4. #54
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    Some years back I swore by the McFarland. A year ago I ordered a Bunch for stock. Put one on a Bolt and the Bolt would not go into the carrier. I tried another and the Bolt went in really tight.
    Took out the Calipers and they all measured differant demensions.
    I now stock Bravo Company rings ( The 3 ring set up).
    I don't have time to play with crap parts.
    http://www.bravocompanyusa.com/BCM-G...t%20of%203.htm

    Also Bravo makes the Best Bolt/Carriers and Parts for them in my book.

    http://www.bravocompanyusa.com/BCM-S...rade%20kit.htm

  5. #55
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    My recent experiences -

    I've been trying to track down why my BM carbine all of the sudden decided it wouldn't feed Wolf 55 grain anymore (acted like it was short-stroking on every shot, so I would have to manually charge it every time I pulled the trigger). I initially changed several things at once, which makes things a little tougher. At the time, I staked the carrier, changed to a mil-spec extension tube, blue Sprinco spring, H-buffer, BCM bolt w/ upgraded extractor parts, etc. I ended up changing back to the original carbine buffer and spring thinking that would get it to back to operating normally, but no dice. It still cycled properly with 55 grain ICC and XM193, so I lost interest in messing with it.

    Then I built my BCM 16" LW middy and hadn't really shot the carbine much since. I refuse to run Wolf through the middy, so I have ammo laying around that's pretty much worthless, which got me re-motivated to work on the carbine. So the other day I decide to take my McFarland ring off the BCM bolt in the BM and put the gas rings that came in the middy in it. Took it out next to the house and it runs through a mag of 55 gr Wolf and locks back just like the good old days....go figure.

    I then took one of my new spare McFarland's and threw it on the middy bolt, it was a super tight fit trying to get it in the carrier and once in I could hardly slide the bolt by hand. I loaded up one mag with 55 & 62 gr Wolf, 55 gr ICC, & 55 gr XM193, took it outside and it ran right through it all with no noticeable problems. Brought it back in and tore it down to clean it and noticed that 20 rnds later the bolt slid fairly easily in the carrier now. I ran about 300 additional rnds of ICC through the middy at the range the other day with the McFarland gas ring still in it and everything seemed to operate fine, except it did fail to lock back one time.

    I just ordered three more sets of gas rings from BCM, I'm sure the McFarland would be fine in the middy, but I feel better going with what I know works without any doubts.
    Last edited by 01tundra; 05-26-10 at 16:25.

  6. #56
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    Quote Originally Posted by patrolman View Post
    Installed the one-piece rings on a straight-from-the-factory M4A1 bolt and a well-used M4A1 bolt this morning. Both bolts had plenty of tension inside their carriers with the new rings and both ran like champs in semi and full.

    It appears my earlier suspicion regarding the bolt carriers was unfounded. The problem was obviously with the one-piece rings from Brownells. I'll be returning those if possible.

    Thanks for providing the information and advice throughout, folks. Much appreciated.
    An M4A1 bolt? Straight from the factory none-the-less...

    Is an M4A1 bolt different than the bolt in an M4 or an M16A4?

  7. #57
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    I am currently using a one-peice gas ring that was labeled 'McFarland gas ring' from Brownells without issue. However, I am paranoid....and have just ordered a proper one from Grant. Mine did seem to offer less resistance than the CMT rings that came with my Bolt. It has functioned fine using a range of ammo, but I would rather have a tighter fit if possible.

    But there isn't a better guy to throw my money at...so it's a win-win. At least now I can sleep at night.

  8. #58
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    What's funny is I purchased 300 sets of McFarlands from Brownells and used them in our Bushamsters in Iraq and there were never any problems.

    In addition if you send them back to Brownells they should refund your money if there is a problem. All of my carbines at home have them and they were also purchased from Brownells.



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  9. #59
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    Quote Originally Posted by Iraqgunz View Post
    What's funny is I purchased 300 sets of McFarlands from Brownells and used them in our Bushamsters in Iraq and there were never any problems.

    In addition if you send them back to Brownells they should refund your money if there is a problem. All of my carbines at home have them and they were also purchased from Brownells.
    Uh,thats a hefty sized reference base there IG.

    To further add Armalite states on their web site an acceptable O.D. dimension as .499"-.501" for the M15.The AR10 is .656"-.659".Im not real sure what they are referencing there other than ring O.D..
    So unless some of the rings being sold,or some folks carrier bores are out of spec Im not sure where any issues would come from otherwise.
    If a rifle runs 100% with the McFarland ring,I just dont see why folks would be so concerned otherwise.
    Glock Certified Armorer
    Armed Protective Services II

  10. #60
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    Quote Originally Posted by Iraqgunz View Post
    All of the ones I purchased for our Bushamsters in Iraq came from Brownells and they all worked 100%. The ones in my personal carbines also came from Brownells as well and they too are 100%.
    Who would take a bushmaster to Iraq?

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