MP-5 Two Stage Trigger - Progress!
Results 1 to 10 of 10
Like Tree2Likes
  • 1 Post By ShootingSight
  • 1 Post By surely_you_jest

Thread: MP-5 Two Stage Trigger - Progress!

  1. #1
    Junior Member
    ShootingSight's Avatar
    Join Date : Apr 2016
    Location : Cincinnati, OH
    Posts : 44
    Mentioned
    1 Post(s)

    Default MP-5 Two Stage Trigger - Progress!

    Got some new help in the shop that has allowed me to get caught up and start devoting time to new projects. So my Christmas break project was tweeking the MP-5 trigger. I tweeked a lot.

    I had a good prototype 18 months ago, but it went on the shelf, plus I realized that in a .308 with a longer bolt stroke, it needed some additional twists. So I have a new trigger put together. Took about 3 or 4 iterations to work out all the details, but it feels fantastic in the lower. Today I'll get it in both a 9mm and a 308 to make sure it cycles and pops a primer, so I know I have the geometry right.

    Goal is to have a good pre-production trigger running at SHOT show in 2 weeks. It's looking good.

    Trigger will be a two-stage. Pull will be about 4 lb. Reset will be short. Takeup will be smooth, due to NiB coating. All parts will be CNC machined from billet tool steel - nothing is cast. This will be an entire drop-in trigger group - no parts interchangeability with OEM parts. It will be ambi, so it will convert every lower to an ambi lower, though I'm still designing the selector. I can make an ugly selector that will be compatible with both metal and polymer lowers, or I can make nicer looking ones, but the two lowers will need different levers, or a different safety cam. Gotta figure out which way I want to go on that one.

    Updates coming, as events warrant.
    USMC-F4 likes this.

  2. #2
    HKPRO PREMIUM PARTNER
    HkCHUCK's Avatar
    Join Date : Nov 2001
    Location : NE Ohio
    Posts : 1,138
    Mentioned
    19 Post(s)

    Default

    Any pics of your prototype trigger pak?

  3. #3
    Junior Member
    ShootingSight's Avatar
    Join Date : Apr 2016
    Location : Cincinnati, OH
    Posts : 44
    Mentioned
    1 Post(s)

    Default

    I'll get some.

    Trigger pack was tested in both a 9mm and a 308, and it popped the primer, and cycled smoothly, so I got the geometry right. Next step is scaling up the one I made to make a half dozen, possibly using heat treated steel, likely a housing in aluminum.

  4. Remove Advertisements
    HKPro.com
    Advertisements
     

  5. #4
    HKPRO PREMIUM PARTNER
    surely_you_jest's Avatar
    Join Date : Apr 2013
    Location : North Texas
    Posts : 1,117
    Mentioned
    8 Post(s)

    Default

    Sounds like an awesome project, keep us posted!

    As far as the selector goes, HK people like things to look original/factory. Regardless of whether its ambi or SEF, I would say the more you can make the selector look factory German, the better. Some folks straight wont buy it if it looks weird.
    Anopstyx likes this.

  6. #5
    LOW SPEED, HIGH DRAG
    UltraFudd's Avatar
    Join Date : Jun 2016
    Location : SE WIS
    Posts : 355
    Mentioned
    7 Post(s)

    Default

    The factory extended selectors are great, as long as you can pick whether you want it on one or both sides.

    A lot of folks weren’t happy with an unnamed trigger company, whose selectors both looked weird and also would interfere with your trigger finger side.

    Glad to see progress.
    /signed/
    A SAR95 SS trigger pack owner.

  7. #6
    Very Senior Member
    rc51pete's Avatar
    Join Date : Jan 2016
    Location : Tennessee
    Posts : 226
    Mentioned
    0 Post(s)

    Default

    Any updates yet? I’ve got some of your M14 triggers & love them. I have a SP5 I’m wanting to try out a trigger for.

  8. #7
    Junior Member
    rcm192's Avatar
    Join Date : Jun 2012
    Location : New Orleans, Louisiana
    Posts : 31
    Mentioned
    0 Post(s)

    Default

    Subscribed for interest! Art I talked to you at Shot. Guys...anything he makes will be an excellent product. The man is a genius.

    Oh and...Thanks again for the Scar carbon scraper bit!

  9. #8
    Junior Member
    ShootingSight's Avatar
    Join Date : Apr 2016
    Location : Cincinnati, OH
    Posts : 44
    Mentioned
    1 Post(s)

    Default

    Couple of weeks of down time in March and April. My two machinists stayed home, and I found myself spending my days on facebook and reading up on covid stats. Kind of depressing, actually.

    But we have rounded the bend, and I've gotten back to the grindstone. Plus, a couple of my suppliers were working while I was not. So I have trigger hubs and hammer hubs, I have springs, I have steel ready to go for all the parts, my aluminum extrusion die was completed and a first run was made for the trigger housings, and I spent time on the CNC, programming the final machining of the housing. This weekend I'll build in the prototype parts to confirm all my dimensions, and I think Monday I turn the EDM machine loose. I also need to get a small batch of housings anodized, just to confirm all my hole sizes. Hard coat anodizing adds about 0.001 to 0.0015 to a surface, so hole diameters shrink by 0.002 to 0.003. I'm using a 4mm drill for the pivot holes (0.1575) for pins that are 0.154, so after anodize, it *ought* to be perfect, though I'd like to check first before I make a bunch of them :-).

    So - good progress, despite everything else.

  10. #9
    Senior Member
    armedjetflyer's Avatar
    Join Date : Nov 2010
    Location : Flight Level 390
    Posts : 178
    Mentioned
    1 Post(s)

    Default

    Interested and subscribed

  11. #10
    HKPRO PREMIUM PARTNER
    Infringer's Avatar
    Join Date : Jul 2020
    Location : Peoples Republic of Maryland
    Posts : 19
    Mentioned
    0 Post(s)

    Default

    Nice. I have your Tavor RPS trigger with the aluminum housing which I got in 13 or 14 (got the Tavor in 13 when MD lost its mind and did a quasi AWB) and it is a fine piece of work. Will keep an eye out

Sponsored Links

 
 

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •