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Thread: Law Tactical folder & A5 buffer issues

  1. #1
    Join Date
    May 2016
    Feedback Score
    4 (100%)

    Law Tactical folder & A5 buffer issues

    So Iím running into an issue with my sbr. Itís a Geissele URG-I 10.3Ē on a KAC ambi lower. I added a KAC sandcutter bolt carrier. The URG-I 10.3 shipped with a H3 buffer and Super42 spring. Iíve ran it for over 1k rounds since August, including through a 2 day class with no stoppages. For the record I run Gen3 Pmags and Federal American Eagle .223 55grain FMJ exclusively (but carry ammo is LE223T3, also .223 pressure). I currently do not own a suppressor for it. My only complaint is the increased sight disturbance under recoil compared to my mid length 14.5Ē & 16Ē guns. I decided to add a law tactical folding adapter and at the same time a A5 buffer system to try and tame some of that recoil. Also at the same time I added a LMT enhanced bolt to try and mimic the KAC E3 that I originally wanted but was out of stock everywhere. So I bought the SR25/M110 receiver extension from Magpul, A5H2 buffer from Vltor, and a SpringCo Green Rifle spring. The castle nut, receiver end plate, and buffer retainer were all changed too, but none of that should matter. I meticulously put it together. Went to the range to do a function check, and got repeated bolt over base malfunctions, and failure to lock back after the last round. Now the receiver extension for the law folder adds 2oz to the cycling mass. I figure the buffer mass was just too much and was causing short strokes. So I replaced one of the tungsten weights with a steel one. Same story. Replaced the final tungsten weight with a steel, and while the bolt over base malfunctions stopped, it still fails to lock back on the last round. I then swapped rifle springs with a guy running a cheap LuthAR spring that was identical in length but felt slightly less stiff and it started locking back. I will admit the rifle was dry while doing my testing, but it was pretty clean, so Iím not sure the lack of lubricant should matter that much. Iíve ordered a Wolff standard power rifle spring to try since SpringCo does not make more than one rifle spring.

    Should I ditch the A5 system all together? With the 2oz carrier extension and a A5H0 buffer, I still have .5oz more cycling mass than before with no extension and a H3 carbine buffer.

    Iíd like to think that lack of lube alone would not cause malfunctions in a clean gun. I do normally run it wet with Slip2000 EWL30.

    Is the SpringoCo green not a direct replacement for a standard weight/power rifle spring?

    Is there anything else that Iím missing that I should check? I donít feel any binding when hand cycling dummy rounds. Ejection under recoil doesnít seem as far or consistent as before.

    Sent from my iPhone using Tapatalk
    Last edited by CESwartz07; 11-16-19 at 19:44.

  2. #2
    Join Date
    Nov 2010
    Feedback Score
    21 (100%)
    It seems like everything should work.

    Verify proper stroke with bolt lugs ~1/4" past the bolt stop.

    Perhaps swap the bolt back to the original and lube it up.
    Black River Tactical
    BRT OPTIMUM Barrels - 16" MPR, 14.5" MPC, 11.5" CQB, 9" PDW
    BRT OPTIMUM-S Barrel - 11.5" CQB Suppressor Gas Drive
    BRT OPTIMUM-S Barrel - 11.5" SB Suppressor, 11.5" SBT 25 Deg Tapered Shoulder Suppressor
    BRT Covert Comps 7.62, 5.56, 6X, 9mm
    BRT MarkBlue Gas Tubes - BRT EXT, EXC and PDW Lengths
    BRT EZTUNE Gas Tubes - CAR and MID
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    BRT MicroTUNE Adjustable Gas Blocks
    BRT CustomTUNE Gas Ports

  3. #3
    Join Date
    Feb 2012
    Feedback Score
    43 (100%)
    Personally, I prefer not to run any 5.56 barrel under 14.5" without the A5. It sounds like your total reciprocating mass is ok. Unless your E-bolt extractor tension is weak, it should be fine to replace a milspec bolt.

    The Sprinco green is indeed stiffer than a milspec rifle spring, and I would only use it with an A5H3 or H4. Try a factory Vltor or Colt spring.

    Sent from my Pixel 3a XL using Tapatalk


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