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Thread: UMP 45 Clone - Need help with .45 3-lug and TiRant

  1. #21
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    Quote Originally Posted by UltraFudd View Post
    I asked Tommy to cut and thread a shortened USC barrel to the standard US thread pitch for .45ACP in .578x28 so I could use SilencerCo’s 3-lug adapter. It fits my current Octane 45 can, and will also work on an Omega 45K that’s sitting in NFA jail waiting for a good home.

    The SiCo 3-lug locks up tight on the Octane and if I can get some decent weather, I’ll take it out and see how much POI shift there is and report back.

    Here’s the view from a few happy snaps:
    Attachment 221018
    Attachment 221020
    Attachment 221022
    Attachment 221024

    Overall look as well:
    Attachment 221026
    Attachment 221028
    Care to update us on how well the combo worked? I think I jumped the gun on my USC conversion. I had it threaded to 16x1 LH for an AAC Tirant 45M (the can is still in jail). Perhaps I should have gone the 3 lug route like you did.

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    Quote Originally Posted by madangler1 View Post
    Care to update us on how well the combo worked? I think I jumped the gun on my USC conversion. I had it threaded to 16x1 LH for an AAC Tirant 45M (the can is still in jail). Perhaps I should have gone the 3 lug route like you did.
    The three-lug works great with my .45 Octane. Easy on/off. Quiet to shoot and accurate. I’ve got the UMP sighted in without the can, and get a little POI shift, but don’t really have any decent comparison info because the weather’s blown chunks since November and I’m really waiting for my Omega 45K to come in to use with the UMP. Waiting on the goddarn stamp since last July (nine months now).

    On an unrelated bitch & gripe; I just got a Form 1 back in 23 days for an SBR and these @$$holes at ATF refuse to use the same background check for a piece of muffler pipe as the one I got for a real weapon! Only the .gov could operate in such a bassackwards way, but after 20 years in Uncle Sam’s Canoe Club, I oughtta know that. But, it’s good for my blood pressure to vent it off. Thanks for the therapy session, I’ll get your bill any day!

    So, back on topic, when I get the Omega, I’ll take the UMP out and shoot with & without the can and see if it shifts. Right now, without the can and my Z-point sight it’s good and tight for a .45 subgun with a 8” barrel. This was on a day when I couldn’t feel my fingers @ 25 yards and shot without the can:
    UMP 45 Clone - Need help with .45 3-lug and TiRant-754cdf78-ff11-452d-be5f-c71fce8922f1.jpeg
    Last edited by UltraFudd; 04-30-2019 at 08:14 PM.

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    Any updates? POI shift tests? Thanks

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    Quote Originally Posted by madangler1 View Post
    Care to update us on how well the combo worked? I think I jumped the gun on my USC conversion. I had it threaded to 16x1 LH for an AAC Tirant 45M (the can is still in jail). Perhaps I should have gone the 3 lug route like you did.
    Silencerco makes the same 3-lug adapter for 16x1 LH. That's what I'm running on my hdps barrel. Never too late to go 3-lug.

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    I am about ready to make the choice for my UMP45 clone so I'd love to hear an update.

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    Quote Originally Posted by meh92 View Post
    I am about ready to make the choice for my UMP45 clone so I'd love to hear an update.
    So, for all those waiting for an update, here’s the latest.

    Still waiting for receipt of a stamp on my Form 4 so that I can test the Omega 45K with my UMP. I’d rather test the gun with the can that’s going to be used with it. Weather finally improved and the NFA Branch help line told me it was approved on Jun 6th, (Form 4 Trust - 314 days), so it’s up to the two feets of the mighty US Post Office now!

    More to follow. News at 6, film at 11.
    Last edited by UltraFudd; 06-11-2019 at 01:51 PM.

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    Quote Originally Posted by madangler1 View Post
    Any updates? POI shift tests? Thanks
    Without further ado, my Omega 45K finally cleared customs. Targets at 25 yards. Used a TSC built USC to UMP SBR conversion.

    230 grain Winchester Ranger T, avg 939 fps, 83* degree day, Zeiss Z-Point dot.

    UNSUPPRESSED:
    UMP 45 Clone - Need help with .45 3-lug and TiRant-photo-jun-26-12-54-43.jpg

    SUPPRESSED:
    UMP 45 Clone - Need help with .45 3-lug and TiRant-photo-jun-26-12-54-55.jpg
    (That flyer on the top was my fault!

    NOTE: the website is doing screwy things with my photos. Tap on the image to view. The targets were shot with numbers on them upright, so view shot placement as such.

    For anyone interested, the LabRadar shot data for the unsuppressed string is here:
    Stats - Average 939.27 fps
    Stats - Highest 956.81 fps
    Stats - Lowest 909.26 fps
    Stats - Ext. Spread 47.56 fps
    Stats - Std. Dev 17.4 fps

    Shot ID V0 V10 V20 V30 V40 V50 Ke0 Ke10 Ke20 Ke30 Ke40 Ke50 PF10 Proj. Weight
    1 957 941 926 919 0 0 467 452 437 431 0 0 216.43 230
    2 920 914 908 0 0 0 432 426 421 0 0 0 210.22 230
    3 919 911 904 883 0 0 431 424 416 398 0 0 209.53 230
    4 936 929 922 0 0 0 447 440 433 0 0 0 213.67 230
    5 954 944 934 920 915 909 464 455 445 432 427 422 217.12 230
    6 909 903 897 0 0 899 422 416 411 0 0 412 207.69 230
    7 949 933 919 895 890 882 459 444 431 409 404 397 214.59 230
    8 955 945 935 920 915 907 466 455 446 432 427 420 217.35 230
    9 956 939 923 902 894 0 467 450 435 415 408 0 215.97 230
    10 954 947 940 0 0 0 464 458 451 0 0 0 217.81 230
    11 924 916 909 0 0 0 435 428 422 0 0 0 210.68 230
    12 938 930 922 0 0 0 448 441 434 0 0 0 213.9 230
    Last edited by UltraFudd; 06-27-2019 at 06:11 PM. Reason: Comments on website rotating photos 90* left

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    @UltraFudd How much further do you think the 3 lug adapter would stick out if I got my barrel cut and threaded so that I could attach a direct thread can?

    I want to use the 3 lug, but in the event I want to revert to a direct thread, I'm thinking about having it cut and threaded long enough for the shoulder and threads to clear the end of the receiver.

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    i have a B&T APC 45 and had the same problem, I opened up the bore of the AAC Trident tri-lug to the barrel diameter of .637 inches on both the adapter and piston, works perfectly. Another option is tge adapter made by Hi Caliber Manufacturing in Ashland, Va, he came up one for the B&T APC45 and the Tri-rant 45. It works just as well as my modified Tri-lug.

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    Quote Originally Posted by gator33 View Post
    @UltraFudd How much further do you think the 3 lug adapter would stick out if I got my barrel cut and threaded so that I could attach a direct thread can?

    I want to use the 3 lug, but in the event I want to revert to a direct thread, I'm thinking about having it cut and threaded long enough for the shoulder and threads to clear the end of the receiver.
    If you look at my post #16 in this thread, the pictures show how far out the 3-lug adapter sticks out. Then adapter has the lug section and you can see the wider internally threaded collar behind the 3-lug section. That collar is threaded almost all the way to the front of the collar section, so the barrel screws in fairly deeply. I’d estimate that if you wanted to do a direct thread, when you switch over and attach the 3-lug adapter, it wouldn’t be more than about an inch further out from what you see in my pictures.

    Make sure that if you thread your barrel that the thread pitch is the same on both the 3-lug adapter and the direct thread mount. There are limited thread options for .45 ACP 3-lug adapters. No piston on the direct thread, but you may need an internal spacer depending on the brand of can.
    gator33 likes this.

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