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snorkelman

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Everything posted by snorkelman

  1. snorkelman

    AGM M4 GBB

    speculation on my part as I haven't fitted that setup to confirm one way or the other, but: 1 I'd expect issues with level of the top rail versus the upper on the rifle (which is going to be all the more noticable on that style of front set where one is meant to be a seamless extension of the other) 2 using the barrel nut supplied with that front end you'ld most likely need to move over to a thin shouldered barrel, and away from the thick shouldered WA style barrel that AGM use on the 061/062 models if you opt to go the other way i.e. a standard KA RIS where normal AR delta r
  2. snorkelman

    AGM M4 GBB

    3rd option for a buffer tube would be to get someone to thread you one from mild steel tube, pretty sure the thread dimensions are somewhere in the thread (probably around sometime in July) only other issue is that you'ld need toget them to fabricate a new multiposition stock block for under the tube too as you need it in carbine config (chap who posted the thread dimensions was fabbing a tube for a fixed stock rifle) if you go with a new lower you'ld really need to buy it along with an upper as theres very few 'cross manufacturer' pairings of upper and lower that work on the WA platform
  3. snorkelman

    AGM M4 GBB

    pull back the delta ring and take off the lower ris panel and you can access the hop adjuster drum theres a slot cut in the base of the outer barrel that lets you access it to swab the hop rubber knock the rear take down pin out of the way withdraw the bolt carrier and have at it with a cotton bud thru the ejection port do you mean the long square profile plastic part under the loading nozzle assembly - if so thats the bb pickup that strips BB from the mag by sounds of it you need a new loading nozzle assembly PM me regarding any bits n bob I should have spare front sight and lo
  4. snorkelman

    AGM M4 GBB

    most likely cause for your low FPS is the positive pressure system being used in the ACM nozzle (either on its own or in combo with a greasy hop rubber) positive pressure - the flute valve inside the nozzle is held forwards in the closed position with a spring that sits behind it - the pressure of a BB sat in front of it is what should then hold it open to route gas for firing you chamber a BB - if it sits slightly too far forwards then theres nothing to act against the flute valves spring and push the flute valve open if you have a greasy hop rubber theres no grip on the BB as
  5. snorkelman

    AGM M4 GBB

    the uppers are close but not directly interchangeable you'ld need to mod an AGM upper a little by looks of a test fit the problems are with alignment of the rear pin - it doesnt get down deep enough to pass thru the ACM receiver you could open up the hole in the rear tab of the AGM upper or you could take material off the lower edges of the rear of the AGM upper to let it sit a little lower second option would probably be best it'll ensure that the bolt carrier gets a straight path into the buffer tube I wouldnt reccommend doing it the opposite way around (AGM l
  6. snorkelman

    AGM M4 GBB

    @ mutikasha, aye you can thumb the safety back to semi to disengage the hammer lock but you leave yourself with the issue that the hammer lock is a bit of a hair trigger on a lot of these rifles, if it fails to do its job it won't need to be tripped by the bolt carrier, and if the unmodified selector is on auto then that 500 FPS DMR will fire auto @weekenny, personally Id leave it decocked with selector on semi, less stress on the hammer spring the reason its like that is it follows the fire controls of the real AR
  7. snorkelman

    AGM M4 GBB

    turning the bolt carrier into a semi-auto carrier doesnt turn the rifle into a semi auto one, it turns it into a full-auto selectable rifle that will lock its hammer up after first shot on auto and needs switched back to semi to clear you're better off modding the selector to remove the bump that disengages the semi auto sear (that will ensure that the selector is always set to semi no mater which of the two settings you turn it to) ,
  8. snorkelman

    AGM M4 GBB

    2 yep the receiver is a lot chunkier construction than that on a typical AEG M4 4 To be expected. When you fire the gun and the mag valve gets depressed the triangle bit is a valve lock - that pops up and locks the valve open. The valve then stays open till the bolt carrier runs over the top of it during blowbacck and forces it back down - the valve can then spring back to its fully extended (closed) position. When you run the mag out of gas then the bolt cant recoil after the last shot, doesnt run over the valve lock which leaves the valve lock engaged when you remove the mag. 5 ye
  9. snorkelman

    AGM M4 GBB

    not sure the G&P bolt carrier is one worth buying, its nice enough for a stock part supplied with a rifle but its still ultimately just a diecast bolt carrier and folks still have a tendency to swap it out. I'd be more inclned to stick the cash to one side and see how much mileage you get out of the standard carrier supplied with the rifle, though that does leave you with prospect of a bit of a delay waiting for a new bolt carrier to arrive as a seperate order if you run with the ACM one untill it breaks.
  10. snorkelman

    AGM M4 GBB

    trivial between the bolt catches on the AGM and JG bottom line all three guns are full of cheap *suitcase* that shouldnt be relied on. You might hit lucky you might not, best to budget for not hitting lucky. Of the three Id buy the ACM cos the parts worth keeping on it are greater in number than parts worth keeping on the other two receiver is metal with decent fit (JG is plastic), can take off the shelf buffer tubes if you fancy a different buttstock (AGM is non standard), better defined threads on upper receiver (AGM arent cut as nicely), less wobble on the RIS, takes any off
  11. snorkelman

    AGM M4 GBB

    tbh design differences at that level are trival - the ACM uses a one piece steel bolt catch the others use one with an insert
  12. snorkelman

    AGM M4 GBB

    isnt that an AGM062 though? (he was asking about the ACM)
  13. snorkelman

    AGM M4 GBB

    if you're going with a larue free float system then you'ld just use the free float barrel nut supplied with it no need for a conventional barrel nut the one I used I pinched from an element delta ring assembly that would be same as this one (the delta ring is alloy I just pinched the steel barrel nut from it) http://www.gunnerairsoft.com/catalog/produ...roducts_id=1153 re the larue handguard length are you sure you want a 9" barrel along with a 9" handguard? fit the two together on one rifle and Im pretty sure the front of the LR will extend far enough to cover even the fl
  14. snorkelman

    AGM M4 GBB

    yep the element steel AEG barrel nut screwed down nice and solid (though the ACM supplied one is solid in that respect too) - I used it in preference over the standard ACM barrel nut because A it was steel (the ACM barrel nut is alu) B it was cut for thin shouldered outer barrels which the steel multi-part outer barrel kit is one of - the ACM barrel nut is cut for thick shouldered barrels. I could have used the ACM nut by just dropping some spacer rings down onto the barrel before screwing down the ACM nut (the chinese multipart barrel comes with a set of spacers)
  15. snorkelman

    AGM M4 GBB

    I would but this ones already been totally stripped and rebuilt so isnt really representative of the stock ACM rifle: KG GunKote Flat Moly grey upper lower and carry handle steel chinese multipart barrel set (just using the CQB length section and shortest extension from that) old set of M4 handguards I had knocking around steel Element AEG barrel nut RAT 3 round burst kit G&P steel mag catch element steel buffer lock steel RAT bolt carrier cheap chinese aluminium hop unit red JDT hop rubber aluminium buffer RAT summer s
  16. snorkelman

    AGM M4 GBB

    I have one (and another on the way) but no buffer tubes to confirm compatibility with other tubes as yet - one reason my review is delayed. Gunners claims it can 'take real tubes' but while it certainly doesnt take AGM tubes Ive yet to see anyone actually confirm that it does take real/WA/G&P/Ino ones, and doesnt just use a different proprietary thread of its own. Confirm it as in actually sitting their and screwing a diferent tube onto it. What I can confirm is that while the inner barel etc are different from WA/AGM etc they can be used along with a conventional WA style
  17. wrong co2 will exert 850 PSI of pressure at 20 degrees C - lower the ambient temperature lower the pressure, higher the temp higher the pressure the only way you'll get less pressure from CO2 is by preregulating it and filling the mag with your lower pressure vapour at which point you'll get as many shots as the volume of your storage container allows - regulate it down to 100 PSI and store the vapour at that pressure in an M4 sized mag you'll get say 2 or 3 shots, at 200 a couple more, 400 a couple more again. Pump straight unregulated CO2 into the mag you'll get a whole lot
  18. snorkelman

    AGM M4 GBB

    erm no need to dent the four side guides, just wedge a screwdriver under the front face of the baseplate and lever it up high enough that the pressed metal detente formed near front of the baseplate clears the front of the main mag shell - the baseplate will then slide straight out along the four guides after that knock the split pin out that holds the outer shell to the mag internals, once its out slide the internals out the top of the mag.
  19. snorkelman

    AGM M4 GBB

    yep Id agree with that, even as a big 3d model of where everything more or less should go its worth it. The only real bummer is having to lay out shipping costs for 3 kilos of dead weight you wouldnt be using though if you pick the right gun you could probably flog most of it off as spares and recoup a chunk of the outlay
  20. snorkelman

    AGM M4 GBB

    yes you can wether its cost effective over buying a donor gun depends on wether some parts are available at any given time and what you're planning to build building a bog standard M4a1? then grabbing a JG and snaffling the trigger guard, pistol grip, stock, handguards, front sight, flash hider, gas tube, ejection port cover, charging handle, auto hammer lock, lower receiver tower end plate, pistol grip mount and firing block from it is much cheaper than buying them individually. however if you're building something more distinctive then you might not have use for almost any of that
  21. snorkelman

    AGM M4 GBB

    I'll pop a review up in next day or two once I've thrown a bundle of parts at it and see how it gets on with them. Id rate the external as better than the AGM, I've swapped the complete hop unit and inner barrel with a standard set, but still to see what parts from the ACM hop unit are individually compatible/easily modded. Bolt stop is steel single part unit (no wee insert) bolt carrier group is pretty cheap n cheerful affair (Id rate the AGM bcg higher and it isnt exactly wonderful) though ability to to get decent ROF from the steel JDT bolt carrier group when fitted on this ACM
  22. snorkelman

    AGM M4 GBB

    just had one finaly turn up in the post picked mine up from Gunners ratherthan RSOV but as far as i know its same gun steel bolt catch steel flash hider steel front end cap for handguards steel castle nut for buffer tube - tube looks to be WA/RS thread (ie not AGM proprietery thread) wobble free receiver (very tight rear pin) cycles nicely with my modified JDT carrier (still to try it with an unmodded JDT carrier need to dig one out) havent had chance to strip it apart just yet to test parts compatibility should manage that later this afternoon offhand Ive got a feeling th
  23. snorkelman

    AGM M4 GBB

    one option for a bolt carrier setup that might be worth considering is an RAT steel carrier at 100 odd bucks combined with a stock AGM nozzle assembly Get fed up breaking 8 dollar AGM nozzle/bolt asemblies and you've got a direct upgrade path to complete RAT NPAS assembly by spending the 150 bucks for a full NPAS kit to fit inside it later The RAT carrier has a few thou of stand off between rear face of the AGM pistonhead and inside face of the blowback chamber which might reduce the likelyhood of cracking the piston face (though depends how much of that wear actually is down to con
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