I'll have to ponder awhile on that.
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i know what you mean on that one!!!...lol...
i had seen a few shorties doing it, but they were doing it when they were brought to me... when i took some of the old airforce slab side/pencil bbl uppers that had no evidence of it and installed my dispersion regulator on them, they started showin probs.......some short strokin, and all showin marks on the inside of the upper that weren't there before....... the dispersion regulator does effect the gas release at the muzzle, but other than that, should have no effect on the gas system.......
my only explanation of how this could happen is that the regulator simulates a longer bbl, and effects the gas system loading...... if this is true, then uppers showing similar marks on the inside of the upper are getting excessive gas/early opening.....and would prob work alot better/longer w/ a proper adjustment on gas system.....
tweak, if you have any other ideas as to why this is happening, let me know!...... i've got a cheapy gas block drilled/tapped for a 6-32 adjustment screw.....all i gotta do is hook up w/ a bud w/ a legal lower to stick a shortie on, and i'll be able to tell ya if this works..... i obviously don't have the yrs of experience you and dano do, but i was an honor grad from the school at aberdeen on these, and worked w/ alot of them at the 7th special forces "contengincy weapons", and the special forces weapons pool on smoke bomb hill...but, that was all back in the stone age....alot has changed since then on these rifles!...lol... i'd really appreciate some feedback from folks w/ more experience...
many thx
skintback
ps: the A1 mod of the regulator is showin amazing potential!.........movement of the gun comes to a complete stop approx 25-30% into the recoil cycle, then pushes itself back to original position...the next mod will time the muzzle return to the cyclic rate of milspec rifles...... w/ a stock A2, my group size w/ the regulator is approx 1/3 of what i can do w/ a stock rifle........everyone that's shot it has had similar results........ in "infantry speak", instead of holding a house sized group on auto @400m, it will hold the front door!..........or, instead of a group the size of a deuce and a half at 200m, it will hold the drivers door......if the drs will leave me alone for a while, i may get this finished and into the military system...... i'm hopin...