My Cetme LC build tutorial ** complete with videos

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[ARCHIVED THREAD] - My Cetme LC build tutorial ** complete with videos

Posted: 12/18/2016 12:25:36 PM EDT

Goin to start my build thread. Received my kit from APEX and it looks to be unissued or factory refurbished. I demilled the trunnion and rear sight. didn't take pics during but pretty much everyone gets the idea.

here are some pics of my kit

Feel free to ask questions.

Posted: 12/18/2016 12:29:53 PM EDT

[#1]

Got a barrel from another builder. After inspecting it, it looks like its from the initial APEX offering. The journals were too small. I cut the barrel off right past the front sight journal.

I sent the barrel to Morgan Richey at class 3 machining in Texas. and had him knurl the journals and thread 1/2x28. the barrel is 12 5/16" long there is .55" of thread. very happy with the work

the barrel pressed in perfect and I used a #16 drill bit to drill the barrel pin. right now its standing at .020~ bolt gap, it will change after its welded in the receiver

last pic of barrel mocked up in the kit

Posted: 12/18/2016 12:34:08 PM EDT

[#2]

Ordered a HMG flat, weldment and disconncetor, its perfect and looks amazing! should be an easy build. Sent it off to 4 bush weapons refinishing systems to get laser engraved, having all the original marking plus my trust info . Borrowed the bending jig from another builder which will help out a lot.
Here is a couple pics of the flat and what images that I sent with it for the engraving

Posted: 12/18/2016 12:38:05 PM EDT

[#3]

Wanted a 4 prong HK style flash hider but I can only find them in M15x1 thread pattern and I had my LC barrel threaded 1/2x28. I used a 5.5" CAR15 flash hider and cut it down to around 4.5" and cut 4 grooves in it to make a 4 prong flash hider. Happy how it turned out, be better if I had a mill but used a drill press, files and a dremel tool. Cold blued it after. With it hand tight it will make the barrel 16.125" after its pinned. It will be removed after I file a form 1 and SBR it. Pic of my kit as it sits right now. waiting on the flat and jig then will be ready to build in a weekend. Also adding a 5" picatinny rail on top of the receiver to mount optics

Posted: 12/18/2016 12:41:53 PM EDT

[#4]

While waiting on the flat to get here I started to do the semi trigger mods. cut the housing to clear the blocking bar, and cut up the auto trip to use as the trigger pin bushing. Also pics of the HMG disconnector vs original.

Posted: 12/18/2016 12:44:26 PM EDT

[#5]

Working on the scope mount, cleaned it up some and blended it to match the rear sight.

Also drilled and tapped the flash hider for a 6-32 set screw and dimpled the barrel. The plan is to fill the top of the set screw with clay or something then weld over it so when I get the Form 1 back I can grind off the weld and unscrew the set screw. (that's the idea anyway)

Posted: 12/18/2016 12:46:51 PM EDT

[#6]

Got my flat in from engraving. Looks great except that I screwed up on the size and location of the selector markings, they are partially covered by the grip and stock. im goin to weld over them and have then relasered

couple pics of the markings and I cold blued the inside of the flat before I bent it.

Posted: 12/18/2016 12:50:00 PM EDT

[#7]

I installed the trigger housing and weldment to check the fitment and also locate where the blocking bar will be welded.

Posted: 12/18/2016 12:50:14 PM EDT

[#8]

Very nice, OP.

Posted: 12/18/2016 12:52:14 PM EDT

[#9]

Cut out and formed a shell deflector to look like the originals that are pressed into the flats

Posted: 12/18/2016 12:54:56 PM EDT

[#10]

welding time. located the blocking bar and welded it in place. then smoothed it out and cold blued it

Posted: 12/18/2016 12:58:22 PM EDT

[#11]

HMG bending jig was tightened in the vice and the jig and flat was lubed up with some high temp bearing grease I got from an old job. Tighten one bolt a couple turns then tighten the other sided until it cant be tightened anymore.

A LC receiver is born!

Posted: 12/18/2016 1:00:41 PM EDT

[#12]

First part of the receiver that I welded was the front of the magwell and where the trunnion welds in.

cleaned up the welds some but still need to clean it up more.

Posted: 12/18/2016 1:02:19 PM EDT

[#13]

next I installed the rear mag weldment. with the mag catch and magazine installed to locate where it needs to be welded. it fit perfect and cleaned up very well. the mags are a little snug with zero play, but not hard to pull out. original cetme and GI mags fit perfect

Posted: 12/18/2016 1:05:25 PM EDT

[#14]

next I welded the rear of the receiver and installed the rear weldment. I had to out shelf of the hmg rear weldment so that I could pivot up the rear of the trigger housing so I could remove the safety. I don't really care for the way hmg has the selector hole set up, had to remove some material at the bottom of the hole so the safety would come out easier. I also had to remove a little over a 1/16" from the rear of the receiver and grind down the pad on top of the receiver so that the LC stock would fit.

as you can see I messed up on the selector marking size and locations, they will be welded up and re lasered when I send it in to be cerakoted

Posted: 12/18/2016 1:07:43 PM EDT

[#15]

next I installed and welded the barrel and trunnion. I did 6 plug welds and welded where the trunnion met the receiver rails. welded on the rear sight block and the cocking tube. had to cut back the top of the receiver about 1/8" for the cocking tube to fit and have the proper gap. Installed the front sight and pinned it in place. also while fitting the handguard I had to remove over 1/16" of the front of the receiver so that it would fit.

Posted: 12/18/2016 1:08:56 PM EDT

[#16]

welded on the shell deflector and picatinny rail. thought I took more pics but think I was too anxious to finish it

Posted: 12/18/2016 1:10:02 PM EDT

[#17]

Nice! Thank you.

Posted: 12/18/2016 1:11:43 PM EDT

[#18]

AND ITS ALIVE!! built it as a pistol first. mainly because I wanted to shoot it suppressed. pics of it as a pistol then after shooting the video I welded on the flash hider and installed the stock. feels springy when you shoot it with the stock, its pretty loose like HK stocks, maybe one day ill figure out a way to tighten it up but I like so far. shot ~250rds without any jams. it did double tap a couple of times but never ran away. the pistol video is 30rds after I test fired it with a couple rds to make sure it wouldnt blow up. probably be the only time I shoot it suppressed, seemed to really hammer the endcap, like it was over gassed. I don't want to break or bend something. only sighted in the aimpoint haven't messed with the sights. it ejects the rounds straight to the right about 20 feet. shot perfecta brass and steel tulammo. bolt gap settled at .015"

had to trim some of the bolt carrier so that the bolt hold open would work, seems like the bho hole was cut 1/8" too far back.

Cetme LC video suppressed

Posted: 12/18/2016 1:15:42 PM EDT

[#19]

some perfecta and tulammo fired brass. the shell deflector really does a number on them

Cleaned up the welds and hit it with some OD green spray paint. looks good green, just have to save up and send to get cerakoted

Cetme LC video #2

Posted: 12/18/2016 1:18:25 PM EDT

[#20]

Empty

Posted: 12/18/2016 1:19:51 PM EDT

[#21]

I welded over the selector markings and worked on the shell deflector some. as of right now ive got about 400~ rds through it without a single failure to chamber or eject or any malfunction. I stretched out the firing pin some to make it stiffer, temp fix as im waiting on HMG to release their spring kit. just waiting for after the holidays so I can replenish my gun fund so I can have it cerakoted and form 1'd

here are a couple pics of some brass and a steel case from last time I went shooting, notice that there isn't the large dents in the case.

Posted: 12/18/2016 2:46:04 PM EDT

[#22]

wow, that looks amazing. Thanks OP for sharing!

Posted: 12/18/2016 8:40:57 PM EDT

[#23]

Anyone think we will ever see these? Like PTR start making them? Extremely cool. Looks like it came straight out of a comic book.

Posted: 12/18/2016 8:51:59 PM EDT

[#24]

HMG Made 100 Ls. Sold out pretty quick at $1500 each. Doubtful any company will make them on a large scale as there isn't many kits. APEX said they imported less than 150 LC kits. Few more LV kits and thousands L kits. Pretty much only way to get one is to build it or have a shop build one.

Posted: 12/19/2016 6:53:38 PM EDT

[#25]

I am so glad someone has documented one of these builds!! I built a regular CETME L up from a APEX kit. Used all HMG stuff as you did OP, it's not a hard build, but pretty technical, and alot of welding and fitting. I love mine so far, I just need to find a way to raise my front site as it's shooting a foot high at 50yds. Also mine won't run brass as of right now, but I only have about 160rnds down the pipe on mine.

OP, I see you ran yours some surpressed, how does it do?? Thinking of supressing mine, but my barrel is that damn 12x20 metric spanish thread

If anyone is interested in building these, let me know, I'm sure OP would be happy to help as well. I also have a HMG bending jig I will rent out if anyone needs it.

Posted: 12/19/2016 10:03:29 PM EDT

[#26]

Good looking build! I built an L last year on a prexis flat, It was an gen 1 flat and was .100" tall, I had to cut the front sight tower and raise it 1/8" to hit poi at 100yds.

I only shot about 15 rds suppressed. It cycled great but the carrier seemed to hit the stock harder due to the increased pressure. its doubtful ill shoot it anymore suppressed due to lack of replacement parts and no different locking pieces. I don't want to damage it.

I think APEXs biggest mistake with the barrels is leaving them the original M12x1. They should have been 1/2x28 or at least M15x1. Only after market flash hider in M12x1 is made by HMG

Here is the clearest Santa Barbra logo I have.

Posted: 12/19/2016 10:56:17 PM EDT

[#27]

Thanks for the logo.

Yeah i'm gonna try some heat shrink on the front site post first. I dont want to have to mess with anything major. I think i have seen your builds on weapons guild, that is before they banned me for using HMG parts. Such a shame as that site would be great if it wasn't run by a crook, and asshole

I do like your idea of adding a rail, i might think about adding one to mine in the future, a red dot would make it awesome! Not too hard to do either really..... getting it strait would be the hardest part?

Posted: 12/20/2016 12:06:38 AM EDT

[#28]

ya, WG can get pretty touchy. I hesitated posting my build using the HMG flat but haven't received any flak yet.

the picatinny rail was pretty easy to add, I just eye balled it, its really straight considering. I wanted to add a rail like the newer LVs but think it will be to hard to mount the rail with the bolt hold open in it. maybe one day...

Posted: 12/20/2016 1:38:11 AM EDT

[#29]

Weaponeer can use the action.

Posted: 12/20/2016 5:50:00 PM EDT

[#30]

Quote History

Quoted:
ya, WG can get pretty touchy. I hesitated posting my build using the HMG flat but haven't received any flak yet.

the picatinny rail was pretty easy to add, I just eye balled it, its really straight considering. I wanted to add a rail like the newer LVs but think it will be to hard to mount the rail with the bolt hold open in it. maybe one day...

View Quote

Will have to look at the next gunshow for a cheap piece of picatinny rail. Only thing is most of those things are made of aluminum right?? How hard is it to find a rail made out of steel?

Posted: 12/20/2016 9:23:49 PM EDT

[#31]

Most are aluminum but there are several steel blanks out there. I got mine from a member on WG for $25. Steel is a lot more expensive. Turbothis makes steel rails. You can find them at Steel picatinny rail.

[ARCHIVED THREAD] - My Cetme LC build tutorial ** complete with videos

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