Category: Heretic Labs Article I

MTW-Spec Parts Compatibility

Parts/CompatibilityAEGReal SteelProprietary
Grips✔
Outer Barrel✔
Inner Barrel✔
Hop Up✔
Body Pins✔
Selector Switch✔
Buffer Tube✔
Bolt CatchWith modification✔
Magazines✔✔
Trigger✔
Rail✔
Buffer Base Plate✔

Troubleshooting Selector Switch/Optical Sensor Issues

MTWs manufactured after October 1, 2021 are equipped with the black Spartan Electronics board with an optical select-fire sensor. This sensor works by detecting a dark or light surface on the selector barrel. Detecting a light surface will set the MTW to semi-auto and detecting a dark surface will set the MTW to full-auto.

A sticker or paint can be used to ensure that the two surfaces are detected correctly by the sensor.

Aftermarket Hop-Up Installation (Video)

Rich discusses hop-up compatibility and demonstrates how to install an aftermarket hop-up for the MTW-Spec platform.

Video transcript: today on what the tech we’re going to be talking hop ups we’re going to show you how to install aftermarket hop up with your MTW so let’s jump right in and take a look at this today we’re going to take a look at how to install an aftermarket hop up in your MTW talk a little bit about compatibility first this is a pro win pro wins work just fine we’ve tested modify element krytac a few other sort of common rotary brands dial types are not going to work the only one that we know is problematic at this point is the max hop up we have made it to work but it is it does require some some effort to do that we’re not going to cover that in this video this will just be standard rotary style hop ups that drop in drop in relatively easily so first thing we’re gonna do is we’re gonna separate upper and lower receiver here this is a it does have the race to co2 stock on it by the way so you’re gonna notice we’ll disassemble it a little bit differently then if you just had a standard standard HP a-line or an external air set those side so disassembly pop the two clips in this case we don’t have to run the airline through because the airline is connected to the hardpoint adapter so we’re gonna disconnect the airline from the connector from the back of the unit big our cylinder out this is the same whether it’s a Reaper or an inferno here I’m gonna slide the stock hop-up out and if you were just doing something with the hop-up this is what you would do you just take it to this point you could disassemble the hop-up I’d do whatever you need to there since we are at going to replace the hop-up completely we’re going to pop the feed tube out as well and you can just rotate back and remove the feed tube now we’re going to need a three millimeter allen key for the two set screws on the top of the rail give them about a half each and your rail will slide right off now you’re going to need an adjustable wrench or one and a half inch wrench to remove the barrel nut barrel alright so all we’re gonna do is pull the spring off here put the spring on our Pro wind hop-up now to install the hop-up what we’re going to do is go at an angle and then there is a gap cut in the receiver here that your dial will drop through now you can slide the outer barrel over the inner barrel align your index you pin your indexing slot we reinstall your barrel nut tighten it down reinstall our rail tighten it down with our three millimeter allen key and reassemble and there we are

Ambi Selector Installation (Video)

Rich demonstrates how to install an ambi selector switch on the MTW-Spec platform.

Video transcript: today and what the tech we’re going to take a look at how you installed the ambi selector switch in your MTW so ambidextrous selector switch is itself pretty easy to install you will need to have already removed your electronics if you do not know how to do this please go watch the video on electronics that we have posted and use that as a guide for removing your control board before you attempt to replace the selector switch well it is possible to replace the selector switch without doing this we do not recommend it as you can very easily damage the switch here your selector switch the barrel can get caught on it as you’re trying to remove it or install it and and break that switch there so we always recommend removing your electronics before you attempt to change the selector switch now you will need whatever tools you’re going to use for that again we go for that in that video for the selector switch you really only need two tools you need a 3/16 allen wrench with a fairly long drive because we’re going to get the grip screw with that and then you will need a 2 millimeter allen wrench for the selector switch itself to remove we’re going to start by removing the grip when we remove the grips we’re going to have our detent spring our grip screw and our grip and then you’ll have the detent it comes out as well final thing will be our standard selector switch here so let’s go ahead and grab an ambidextrous selector switch and show you how to install that the ambidextrous selector switch is going to come with a few pieces in the bag you will get two screws they are identical you will get two paddles there are different lengths the you have the longer paddle which is our standard paddle which we generally put on the left side of the gun and you have the short paddle which we generally put on the right side of the gun but these are reversible you can pick which side you want them on either way is fine and then you will also get your ambidextrous selector barrels you will see it has the notch to take the paddle on both sides the side with the detents on it is going to end up on the right side of the gun so before we assemble this figure out which side we want the paddle on and use that as your reference so we’re going to put the long paddle on the left side like we normally do here you can see there is a cutout in the molded part here that matches the cutout on the barrel and these can be a little bit snug but if you sort of catch the the flat edge together and then kind of snap them straight together they generally go without too much trouble then we’re going to take our two millimeter allen key and we’re going to tighten this down if you want a little bit of blue loctite would not go amiss here but don’t use anything permanent because you likely at some point won’t want to disassemble this again so a little blue loctite wouldn’t be a bad idea but it’s generally not really necessary now second paddle we’re not going to install until we have it all back together so with the one paddle installed detents again go towards the right side of the gun so we’re gonna go ahead and slide it in now if we flip it upside down we can drop our detent pointed end first into the hole right here okay I’ll lay it on our side and let it tip back too much to the detent doesn’t fall out then we’re gonna get our grip here so the detent spring goes in the hole in the grip and then our allen key there are two holes in this grip because you have the ones with the airline but our allen key goes in the small quarter inch hole at the front of the grip and then we’re just gonna put it all together kind of sideways that prevents the detent or the spring from falling out and just sort of feel around until you thread feel the thread start there you go check before you tighten it all the way down that your spring is actually engaging on the detent you can sometimes get the spring kind of folded over and you don’t want to crush the spring so make sure it’s actually engaging on the detent before you finish tightening it down alright you can check that work working properly now for the second paddle or somebody going to do the same thing as we did on the opposite side line up the square edge pop it on take our two millimeter allen key and our other screw tighten it down there you go now you can proceed with reinstalling your electronics and your trigger and you’ll be ready to go so that’s how you install your ambidextrous selector switch on your MTW

Aftermarket Grip Modification (Video)

Rich demonstrates how to modify an aftermarket grip to fit MTW-Spec platforms.

Video transcript: what’s up guys today I’m with attack we’re going to be showing you how to install a custom grip on your MTW so today we’re going to be talking about how to install a grip on your MTW or rather how to modify it so that it will work now the MTW uses standard AR grips this is just a normal a – style grip nothing fancy here but this same principle will work regardless of what grip you choose to use now if you are a shop or somebody that plans to do a lot of these builds we will be making a drill guide that will make this process simple and foolproof but if you’re just doing one and you don’t want to get the drill guide or you’re an early adopter and drug ID isn’t available yet we’re gonna show you how to do this so tools you will need if you are not using the drill guide you’re going to need a set of calipers or some other way to measure fairly precisely position you will also want a 3/8 inch drill bit and a half inch drill bit if you are only planning on running your electronics down into the grip say you’re running a race arrow or rate co2 and you just need the electronics in there then you can get away with just the 3/8 if you’re going to run the air line through you don’t want the half-inch as well you will also want a drill at the back edge of the grip there is a corner down in the grip there all we’re going to do is measure a quarter inch or if you’re in metric six millimeters is close enough from that my inside corner from this corner here six millimeters or a quarter inch away from that edge so we’re gonna use the calipers from this direction we can mark that position with the calipers okay so we’ve got ourselves marked there at this point if you wanted to use a center punch that would be a good idea to keep you centered hey Kody do we have that if you don’t have a center punch it’s not the end of the world but it will help you stay a little more on target and I’m kind of scribed a line with the back of the calipers and that and you can also generally on these you’ll be able to see a mold line right along the center if not it’s it’s fairly easy to estimate the center or you can try to measure so this is 3/8 of an inch across here so you can measure the middle if you need to but in this case we have a nice bold line so I’m just gonna go right in the center and then we’re gonna punch you know to give us a nice center mark to start drilling with and take my three-inch drill at this point and I’m going to just drill a hole straight through I want to stay as perpendicular to this surface here the surface that makes up sort of the angle at the bottom of the grip block when it stays perpendicular to that surface as I can and generally it’s going to be at an angle that was sort of like this in the grip it will end up I hang a little bit away from the back edge of the grip unless you are doing certain grips that are a steeper grip angle so get centered on my mark okay so there is our 3/8 inch hole now we could clean this up and again if you were just running the wiring through here that’s probably big enough to get your wiring through and we should be alright but if you’re going to do the air line you don’t want the half-inch hole now what we’re gonna do with the half-inch is we’re gonna switch over to it I’m actually gonna drill from the bottom into the hole I just made we’re joined plastic so it tends to make big chips there we go you can see we just ran the half-inch up through the hole that we started with 3/8 and the reason we start with the 3/8 is because you can see the half-inch cuts into the sides here a little bit and if you don’t if you try to drill with half-inch from this side you’re gonna have trouble have trouble doing that but by starting with 3/8 that gets us on the in the right location and then we can run the 1/2 inch from the bottom up through use the 3/8 as a guide and you should be in good shape there again we will be doing another video once we get the drill guides finished up and how that won’t work is it will just be a block that you can attach your grip to and it’ll have a sleeve essentially that you can run the drill bit straight through in one run and it will make sure it’s located perfectly every time and you don’t have to worry about it but if you’re doing a one-off or you’re just getting started and when I want to do this and we don’t have the drug guides out yet this will get you started and we’ll get the job done so thanks for watching guys as always if you have any questions leave them in the comments below we will do our best to answer them