ardrummer292 Posted June 17, 2019 Report Share Posted June 17, 2019 Has anyone managed to add semi-auto functionality to their M249? I'd love to have the option to roll into the back of the stack after providing suppression. Link to post Share on other sites
gisburn20 Posted June 17, 2019 Report Share Posted June 17, 2019 You would need to completely replace the gearbox, as in rebuild the gun take a V2 or V7 gearbox. Or buy a support gun based around a V2 gearbox like a Shrike or something. The stock M249 gearbox is very basic inside, no cut off lever or trigger trolley, just a microswitch turning the motor on and off. Jim. Link to post Share on other sites
Tarr Posted June 17, 2019 Report Share Posted June 17, 2019 G&P M249s are based on V2 gearboxes. You could probably add semi auto functionality there with ease. If you allready have an A&K it's still possible with a programmable mosfet, no way to add a physical switch tho. Link to post Share on other sites
3vi1-D4n Posted June 17, 2019 Report Share Posted June 17, 2019 On a G&P M249 you might be able to get away with it with say a Gate Titan for V2, since it use a V2 mech. You could program a 2 stage trigger for a selector. Otherwise, other 249s might be a bit difficult. Link to post Share on other sites
ardrummer292 Posted June 18, 2019 Author Report Share Posted June 18, 2019 12 hours ago, Tarr said: You could probably add semi auto functionality there with ease. If you allready have an A&K it's still possible with a programmable mosfet, no way to add a physical switch tho. I recall seeing a guy at my local field using a CA/clone Minimi with semi auto. He appeared to be using the safety as a fire selector. Any idea how that might be possible? I'm sure it's some sort of digital fire control, but I'm stumped beyond that point. I wonder if I could program the WARFET installed in my Minimi to help out with this little project. Link to post Share on other sites
Tarr Posted June 18, 2019 Report Share Posted June 18, 2019 Most programmable mosfets detect the one turn of the sector gear with a microswitch against the little nub that normally moves the cutoff lever. You could adapt a mosfet to the m249 layout for the cutoff function. Same goes for the selector switch, its just a microswitch that needs to be tripped, the safety bar could do that if you place it right. Shame there is no ready made solution for this as far as i know but it can be done with a bit of soldering and tinkering. Link to post Share on other sites
ardrummer292 Posted June 18, 2019 Author Report Share Posted June 18, 2019 The Gate WARFET is outside of the mechbox, so I'm not sure if it could be modified to add semiauto to an otherwise fullauto-only gun. I'm not too keen on buying a bunch of new stuff to get this to work, especially not a whole new gun or expensive MOSFET. Link to post Share on other sites
Tarr Posted June 18, 2019 Report Share Posted June 18, 2019 Well there is no easy way to do this, the A&K gbox was never intended to have this feature. A Gate WARFET wouldnt work. You have to have some way to detect a cycle and the WARFET depends on the cutoff lever to do that. Since a cutoff doesnt have anything to "cut off" like in a v2 gearbox the only real option is a custom fitted computerised mosfet that uses microswitches to detect a cycle. It can be done if you are determined enought but bottom line it's probably more efficient to just get a sidearm for those cqc moments, getting a mosfet that can do this and modifying it would cost about the same Link to post Share on other sites
ardrummer292 Posted June 19, 2019 Author Report Share Posted June 19, 2019 I've got a couple reliable sidearms, I'm just not keen on bringing a handgun to a rifle fight. Reckon I'll just try to talk my A-gunner into carrying an MP5 or summat for me. Link to post Share on other sites
3vi1-D4n Posted June 20, 2019 Report Share Posted June 20, 2019 I have used a number of MGs indoors, and it is definitely less manouvreable than a carbine/PDW/SMG, though not less than anything longer than an AK47. TBH anything is possible, the question is how flexible are your field rules to having an MG class rifle indoors event on semi-auto. TBH with speed triggers today, semi might as well be full auto. Putting a programmable mosfet seems to be the best way to go about creating select fire on the MGs. Link to post Share on other sites
ardrummer292 Posted June 21, 2019 Author Report Share Posted June 21, 2019 I'm not fussed about the bulk of the gun. As long as it chronoes within rifle limits and is actually capable of semi auto, the field doesn't care what it looks like. A pretty fair approach, if you ask me. Blade/double triggers are banned at my local, so absurd semi-spamming is infrequent. I'll give the project some more thought. As it stands right now, I'll likely continue to keep my MGs in reserve as specialty weapons for open terrain fighting. Link to post Share on other sites
ardrummer292 Posted November 21, 2019 Author Report Share Posted November 21, 2019 Bit of a necropost, but I figure an update is in order. I ordered a Burst Wizard, which I intend to program with a 1 round "burst" and a 1 second delay. This will manifest as such: Upon pulling the trigger, 1 round will fire. Keeping the trigger depressed results in no additional rounds being fired for 1 second. Keeping the trigger depressed longer than 1 second results in normal full auto fire. This effectively converts the trigger into a 2-stage setup, with the difference between stages dictated by time (rather than distance pulled). I believe the 1 second delay removes any possibility of me accidentally full-autoing people in close quarters. I'll do some testing to ensure that this assumption is correct. Link to post Share on other sites
ardrummer292 Posted November 29, 2019 Author Report Share Posted November 29, 2019 Received and installed my Burst Wizard 3 today. My thoughts... Hard-wired installation is a snap, especially with the dual signal wires included. My Minimi was already wired for a Gate WARFET, so the extent of my "hard-wired installation" was unplugging the WARFET and plugging in the Burst Wizard. Absolutely brainless install. If your gun has a high rate of fire, getting the 1 round burst setting to only fire one round will probably take some work. Here's what I went through: - Using command 2, I set the burst length to one round. Upon testing, I was getting 2-3 rounds per burst. Damn. - Using command 7, I set the sensitivity to the highest number, which is 19. I was still getting 2-3 round bursts. Double damn. - Using command 11, I set the burst length to 30 ms. Still got the occasional double cycle. Better, but still damn. - Using command 11 again, I modified the burst length to 24 ms. Consistent single round "bursts" with crisp trigger response. Perfect. - Please note that, if you have to manually set the burst length, yours will almost certainly be different than mine. The correct burst length to fire a single round depends on battery voltage, motor type, spring strength, gear ratio, and a million other things that are impossible to predict. I actually had to change my burst length when I downgraded springs (27 ms was perfect for a Guarder SP120, but 24 ms was just right for a Guarder SP110). The stock 0.6 second delay between burst fire and full auto is too short to be safe in CQB, in my opinion. I really don't want to accidentally lace anyone up at close range, so I used command 3 and set it to 1.0 seconds. A bit overkill, but I'd rather be safe than labeled an *albartroth*. Link to post Share on other sites
ardrummer292 Posted December 9, 2019 Author Report Share Posted December 9, 2019 Apologies for the quadruple-post, but I feel that this video clearly illustrates the benefits (and limitations) of this mod. Link to post Share on other sites
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