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  • teratos

    My hair is amazing
    MDS Supporter
    Patriot Picket
    Jan 22, 2009
    59,943
    Bel Air
    An option to shoot with a folded stock. Should be interesting.

     

    teratos

    My hair is amazing
    MDS Supporter
    Patriot Picket
    Jan 22, 2009
    59,943
    Bel Air
    Already a post on these:

    I'm w/ the 2nd poster (jrumann), just get a BRN180 or MCX upper and be done w/ it.
    Dammit.

    I already have the BRN-180. I like it. there is a suppressed and unsuppressed setting. By the time you get both BCGs, you spent BRN money.
     

    alucard0822

    For great Justice
    Oct 29, 2007
    17,745
    PA
    not enough mass to handle direct blowback without a buffer. I'm sure there are companies working on a BCG that offers delayed blowback, short stroke and drops into a standard upper with a standard AR9 barrel, the first one will take over the market. Have seen a couple that lock into the cam key in the upper, or a mechanism that locks against the rear of the carrier.
     

    teratos

    My hair is amazing
    MDS Supporter
    Patriot Picket
    Jan 22, 2009
    59,943
    Bel Air
    not enough mass to handle direct blowback without a buffer. I'm sure there are companies working on a BCG that offers delayed blowback, short stroke and drops into a standard upper with a standard AR9 barrel, the first one will take over the market. Have seen a couple that lock into the cam key in the upper, or a mechanism that locks against the rear of the carrier.
    I have the Scheel system on my colt pattern 9mm AR. It works pretty well.
     

    John from MD

    American Patriot
    MDS Supporter
    May 12, 2005
    23,100
    Socialist State of Maryland
    not enough mass to handle direct blowback without a buffer. I'm sure there are companies working on a BCG that offers delayed blowback, short stroke and drops into a standard upper with a standard AR9 barrel, the first one will take over the market. Have seen a couple that lock into the cam key in the upper, or a mechanism that locks against the rear of the carrier.
    I was thinking about for my CMMG Banshee. :D
     

    alucard0822

    For great Justice
    Oct 29, 2007
    17,745
    PA
    I have the Scheel system on my colt pattern 9mm AR. It works pretty well.
    True Roller delay has a mechanical advantage through a wedge to compress the main recoil spring/s at a higher rate to delay the blowback phase, then unlocks and a lower rate to complete the cycle. Most like the JP that use the wedge/roller setup lock into the upper or barrel extension. The CMMG RDB uses friction instead of a mechanism to increase rearward travel against the spring. The scheel uses the rollers and aditional small springs to increase resistance for the blowback delay. Mean arms has a system that uses ball bearings to lock in a barrel extension. They all require a lot of proprietary parts. Allegedly Aero and NFA were working on a system that uses a roller that locks into the cam cutout in a mil-spec lower, or a proprietary upper/BCG that lock similar to the HK/JP5 solution, but much less expensive. Think FM products was working on one that worked in the gen2 receiver setups and locked in top of the receiver where the charging handle would normally be, and did not require a buffer tube.
     

    teratos

    My hair is amazing
    MDS Supporter
    Patriot Picket
    Jan 22, 2009
    59,943
    Bel Air
    True Roller delay has a mechanical advantage through a wedge to compress the main recoil spring/s at a higher rate to delay the blowback phase, then unlocks and a lower rate to complete the cycle. Most like the JP that use the wedge/roller setup lock into the upper or barrel extension. The CMMG RDB uses friction instead of a mechanism to increase rearward travel against the spring. The scheel uses the rollers and aditional small springs to increase resistance for the blowback delay. Mean arms has a system that uses ball bearings to lock in a barrel extension. They all require a lot of proprietary parts. Allegedly Aero and NFA were working on a system that uses a roller that locks into the cam cutout in a mil-spec lower, or a proprietary upper/BCG that lock similar to the HK/JP5 solution, but much less expensive. Think FM products was working on one that worked in the gen2 receiver setups and locked in top of the receiver where the charging handle would normally be, and did not require a buffer tube.
    I'd get that in a heartbeat.
     

    outrider58

    Cold Damp Spaces
    MDS Supporter
    True Roller delay has a mechanical advantage through a wedge to compress the main recoil spring/s at a higher rate to delay the blowback phase, then unlocks and a lower rate to complete the cycle. Most like the JP that use the wedge/roller setup lock into the upper or barrel extension. The CMMG RDB uses friction instead of a mechanism to increase rearward travel against the spring. The scheel uses the rollers and aditional small springs to increase resistance for the blowback delay. Mean arms has a system that uses ball bearings to lock in a barrel extension. They all require a lot of proprietary parts. Allegedly Aero and NFA were working on a system that uses a roller that locks into the cam cutout in a mil-spec lower, or a proprietary upper/BCG that lock similar to the HK/JP5 solution, but much less expensive. Think FM products was working on one that worked in the gen2 receiver setups and locked in top of the receiver where the charging handle would normally be, and did not require a buffer tube.
    The JP5 uses the same rollers/parts as the HK doesn't it?
     

    teratos

    My hair is amazing
    MDS Supporter
    Patriot Picket
    Jan 22, 2009
    59,943
    Bel Air
    The JP5 uses the same rollers/parts as the HK doesn't it?
    it does, but it does not work the same way the H&K does. The H&K won't unlock until the pressure in the chamber drops allowing the rollers to release. In the Scheel, the spring tension on the rollers absorbs some of the energy, so there is less felt recoil
     

    alucard0822

    For great Justice
    Oct 29, 2007
    17,745
    PA
    The JP5 uses the same rollers/parts as the HK doesn't it?
    Don't think it is the same parts, but definitely the same design. They did have different angled wedge pieces to tune for different loads. The HK system basically uses the rollers in fixed pockets, to squeeze against the angled wedge inbetween. The wedge is forced rearward against the spring at a greater distance than the bolt is moving rearward. This is what delays the very strong blowback of the case in the chamber. One chamber pressure drops and the case is no longer sealed in the chamber, the unlocked bolt and carrier move rearward against the spring directly, and it cycles.
     

    outrider58

    Cold Damp Spaces
    MDS Supporter
    Don't think it is the same parts, but definitely the same design. They did have different angled wedge pieces to tune for different loads. The HK system basically uses the rollers in fixed pockets, to squeeze against the angled wedge inbetween. The wedge is forced rearward against the spring at a greater distance than the bolt is moving rearward. This is what delays the very strong blowback of the case in the chamber. One chamber pressure drops and the case is no longer sealed in the chamber, the unlocked bolt and carrier move rearward against the spring directly, and it cycles.
    I'm pretty sure the actual rollers are HK rollers. I watched their rollout on the gun a while back, but no biggie.
     

    alucard0822

    For great Justice
    Oct 29, 2007
    17,745
    PA
    I'm pretty sure the actual rollers are HK rollers. I watched their rollout on the gun a while back, but no biggie.
    might be, would be cool if so. I know they were talking about copying some of the aftermarket HK pro wedge tunbing kit things with different wedge angles.
     

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