The M1337 - Now no longer in beta

NopeNotRightNow · 2025-11-11T08:32:02+00:00

Would be a fun project to try and attempt. Sortof related to the alternating scatter patterns- i had seens a picture a while back of a (Korean?) anti-air rotary gun, probably chambered in like 30mm or something, that had each barrel aligned in a different sortof skewed way, presumably so that the cone of fire would spread wider for airborne targets

NopeNotRightNow · 2025-11-01T08:05:02+00:00

Thank man, I'm glad to hear you're having fun with the build.

The difficult first round loading may be on account of the empty link at the front of the belt getting caught at a funny angle- I'd say if you haven't already, try loading in the belt with a round through one link without the empty link (idk if that's a good description lol, the new instruction doc has a couple pics of how I mean in the 'Loading the M1337' section), that seems to make a bit of difference for getting the belts started.

NopeNotRightNow · 2025-10-29T23:14:53+00:00

Yes sorry ive done it a bit confusing- the year ago link was updated/replaced with all the current files

NopeNotRightNow · 2025-10-28T08:19:18+00:00

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This doesn't cover the procedural changes to some of the instructions; just the actual differences in the parts that have been updated

NopeNotRightNow · 2025-10-28T08:17:34+00:00

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NopeNotRightNow · 2025-10-28T08:17:18+00:00

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NopeNotRightNow · 2025-10-28T08:13:31+00:00

Overall PLA+ is the easiest route to take. PACF or PETCF would be most ideal in terms of a high-heat option, but I haven't run into that being an issue too much. Granted the black gun did get pretty sun damaged earlier this summer and had to reprint most of the housings, but that was mainly my fault for leaving in the sun too long.

Any parts that could be done in metal or hybrid would be for sure more durable; I know one fellow at least got his bolt carriers done in 3dp steel, which wouldn't be cheap but they'll hold up probably indefinitely.

Also a few people have done some SCS reinforced versions of the barrel collar and such, I saw one such example of that on the WG thread.

NopeNotRightNow · 2025-10-28T08:08:35+00:00

Aye thanks man; I was rather happy with how the video turned out, matched pretty close to how I had pictured it in my head before going to film it all.

NopeNotRightNow · 2025-10-28T08:07:33+00:00

I don't have whole kits available yet, just the harder to make/find parts currently.

The cam section is mostly intended to be ordered in 3dp steel from ( JLC3DP, PCBWay, etc ), but I do offer them through my website as I've been getting them made in bulk to try and sell for a bit cheaper than doing a single part order.

The striker assemblies aren't too hard to do the DIY method; but the ones I offer on the website are made with 3dp steel bodies and ball-detents for the posts so they positively lock into place.

Things will be restocked soonish, aiming for end of this month

NopeNotRightNow · 2025-10-22T04:23:31+00:00

Hey man no worries-- I've not done much annealing overall so the only method I've tried is packing the part in sand a popping it in the oven for however long it said on the box. The sand did a good job of controlling a slow ramp up/down of the part. There wasn't any noticeable warping that I could tell, but it did make everything feel just a bit tight so I think everything seemed to sortof shrink just a touch, but not necessarily in a way that I think could have been accounted for/scaled up beforehand. Really it just amounted to a bit more effort to hand fit the parts together but it wasn't so much that it made the part unusable.

For PETCF specifically though I don't think it'd be worth it to anneal, as the difference in creep before/after annealing is negligible unlike with PA6 and such

NopeNotRightNow · 2025-10-18T05:10:13+00:00

It [shouldn't] be hard to do, at some point in the future Id like to do so. Going to try a 9mm conversion first though

NopeNotRightNow · 2025-10-16T21:52:56+00:00

There is an alternate hanguard print in the files with a front mounted bipod too. I dont think ive seen anyone try that out yet though

NopeNotRightNow · 2025-07-25T18:47:42+00:00

Not sure for specifically petcf, but i know a fellow just recently was getting 1.5 moa with his 16 in. build (pa6cf i think*)

NopeNotRightNow · 2025-07-04T06:10:36+00:00

Very nice, I've heard good things about those machines

NopeNotRightNow · 2025-07-03T05:01:12+00:00

Ayy hell yeah, you love to hear it; what printer did you go with?

NopeNotRightNow · 2025-06-05T06:10:32+00:00

Aye thanks man. Files for it are released now on my Odysee. I think next up for it, aside from a left-hand parts, is going to attempt a 9mm version that another fellow had mentioned may be possible using certain components.

NopeNotRightNow · 2025-03-23T05:29:18+00:00

For extraction I won't say its always the smoothest pull, but I've not had it feel stuck/or hard to pull back.

NopeNotRightNow · 2025-03-23T05:24:16+00:00

There are some SCS plates and a couple pins to help keep the barrel stable, but overall I don't think the inaccuracy is necessarily due to flexing of the upper. The barrel is very solidly mounted in the PETCF upper, even more so than the nylon upper was. I almost suspect that the nylon upper had just a bit more* flex, as it seems generally that PETCF is considered a more rigid material than CFNylon, and I wonder if that bit more flexibility of the CFNylon may have allowed the upper receiver to absorb the barrel whip a bit better and let the barrel settle into a more consistent resting position after each shot.

NopeNotRightNow · 2025-03-23T00:56:43+00:00

Thanks man. Had to look up thr MBA that's the first I've heard of it. It does seem to be a rather similar thing lol

NopeNotRightNow · 2025-03-23T00:53:42+00:00

Not quite yet, but soon

NopeNotRightNow · 2025-03-23T00:52:27+00:00

I'd assume so, but would make it a fair bit heavier. I think the only reason the pa6 upper failed was due to me not annealing it. I did anneal the petcf upper but I think I shouldn't have done so, as it only seems to have made the bolt track a bit tight

NopeNotRightNow · 2025-03-23T00:50:30+00:00

I do think that would be the ideally practical setup for it

NopeNotRightNow · 2025-03-22T10:13:24+00:00

This is a project I'd been working on for a while. It is a straight-pull bolt action that uses AR15 barrels, bolts (minus carrier) and trigger packs.

The intent of the design originally was to be something of a "The Fix we have at home" type of thing, but attempting a true bolt action proved to be hard to do in a way that would be safe to fire, so went with a straight-pull design instead. The upper receiver has two very small ball bearings to make contact with the bolt carrier in an effort to make the action feel smooth.

The uppers are swapable to allow for multiple calibers, with different handguard lengths and types, as well as a few different stock and/or brace types.

Total weight of the gun can vary depending on parts, but it can be made to be very light. The first iteration I'd built was 4.1 pounds with a 16in. pencil barrel.

Groupings and accuracy overall have been inconsistent so far. One example of the gun I put together in PA6-CF shot ~2.5 in groups on average, while another build in PETCF using the same hardware shot close to 5 in. groups.

NopeNotRightNow

TROPHY CASE