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Thread: SP5 Trigger Housing Question

  1. #21
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    Quote Originally Posted by vinnymac View Post
    Thanks for posting the pics. Pretty interesting the label on the bag is for a G3 trigger housing. It looks like it's just a clipped and pinned G3 housing with the rear tang trimmed to fit the SP5.
    I noticed that also, but I'm not familiar enough with the G3 to form an opinion.

    The housing lines up perfectly, with no play.

    SP5 Trigger Housing Question-img_0694.jpg
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  2. #22
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    Yes, that's all it is. A shorthened G3 housing, which is no problem. All the full size semi auto housings are the same spec in all regards except the 308 housing has the longer tang for the double push pins. Many MP5 semi auto housings are nothing more than a G3 with the tang properly shortened. However I am sure a factory German MP5 semi auto housing is not cut down, and manufactured with the shorter tang from the get go.
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    Quote Originally Posted by GTS197 View Post
    I noticed that also, but I'm not familiar enough with the G3 to form an opinion.

    The housing lines up perfectly, with no play.

    Click image for larger version. 

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    Can you post a side by side shot of your original SP5 housing and the new clipped and pinned housing? Specifically, I'd like to see a comparison shot of the front shelf (where the dogbone cutout is) and a comparison shot of the rear tang. Thank you!

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  5. #24
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    Quote Originally Posted by vinnymac View Post
    Can you post a side by side shot of your original SP5 housing and the new clipped and pinned housing? Specifically, I'd like to see a comparison shot of the front shelf (where the dogbone cutout is) and a comparison shot of the rear tang. Thank you!
    Not a problem. I'll do it when I get home.

  6. #25
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    Guess I didn't pay any attention to it when I installed it, but it has obviously been cut down. Good call @TallPine .

    Here are the pics, as requested.

    ETA: In the first two photos, the trigger pack is in the 4-pos housing.

    SP5 Trigger Housing Question-img_0700.jpg

    Attachment 252648

    SP5 Trigger Housing Question-img_0701.jpg

    SP5 Trigger Housing Question-img_0702.jpg

    SP5 Trigger Housing Question-img_0703.jpg

    SP5 Trigger Housing Question-img_0705.jpg

  7. #26
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    Forgive my ignorance, but why the difference on the 'tail end?'

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    Quote Originally Posted by GTS197 View Post
    Guess I didn't pay any attention to it when I installed it, but it has obviously been cut down. Good call @TallPine .

    Here are the pics, as requested.

    ETA: In the first two photos, the trigger pack is in the 4-pos housing.

    Click image for larger version. 

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    Attachment 252648

    Click image for larger version. 

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    Click image for larger version. 

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    Click image for larger version. 

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    Click image for larger version. 

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    This is very helpful. Thank you so much for taking the time to post pics!
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  9. #28
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    Quote Originally Posted by esh21167 View Post
    Forgive my ignorance, but why the difference on the 'tail end?'
    The 4-pos housing started life as a G3 housing, with dual push pins. They cut it down to fit the single push pin of the 9mm end cap.

  10. #29
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    ^additionally, the tail ends can have different shapes. Maybe thats what @esh21167 was questioning. Some "tail ends" or "tangs" have a full box-shape look with an actual pin hole in the "box". Others are much more cut open with no actual hole...the push pin just slides through and the housing is held in place by pushing up against the pin (versus being "locked" into an actual pin hole). Both styles are pictured above, and they both hold the housing nice and snug. I have no idea why the different designs. But logically speaking, I think pushing a pin through the more open style is generally going to be easier with less hang-ups since you don't have to have everything perfectly aligned like you would if you had to push the pin through holes in the receiver AND the holes in the lower housing "tang". YMMV

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    Quote Originally Posted by UltraFudd View Post
    The “ears” on the SP5 are significantly thinner than on a standard SEF MP5 housing.

    I’ve got both and will measure thickness of both and post them, but gotta work tomorrow a.m., so it’ll be later.

    My MP5 SEF housing definitely does not fit - it’s too tight! (corrected)
    I measured three housings; a OEM Ambi SP5K, OEM Ambi SP5 and a OEM Zenith SEF (dual pin) housing using a digital dial caliper (units in mm).

    SP5 Trigger Housing Question-photo-feb-20-16-08-44.jpg
    SP5K
    EAR THICKNESS AT REAR: 5.5
    EAR THICKNESS AT TIP: 4.0
    GAP BETWEEN EARS: 20.5
    SHELF CUT (WxH): 20.4 x 6.0
    DOG BONE (H): 8.5

    SP5 Trigger Housing Question-photo-feb-20-16-11-14.jpg
    SP5

    EAR THICKNESS AT REAR: 5.3
    EAR THICKNESS AT TIP: 4.1
    GAP BETWEEN EARS: 20.5
    SHELF CUT (WxH): 20.5 x 6.0
    DOG BONE (H): 10.0

    SP5 Trigger Housing Question-photo-feb-20-16-09-07.jpg
    SEF for Z-5RS (double pin)
    EAR THICKNESS AT REAR: 6.3
    EAR THICKNESS AT TIP: 5.5
    GAP BETWEEN EARS: 18.3
    SHELF CUT (WxH): 16.0 x 5.5
    DOG BONE (H): none

    So, the SEF gap between housing ears is 2.2mm smaller than an OEM Ambi housing and is too tight without shaving a millimeter off the inside of each ear.

    The Zenith housing also has a slight protruding shelf along the bottom edge of the cut, where the SP5 and SP5K have a flat “front” on the housings.

    The SEF housing is between .6 and .8 mm thicker externally on the outside of the ears.

    (Tap on thumbnails for full size pix)
    Last edited by UltraFudd; 02-20-2020 at 10:45 PM. Reason: For clarification of housing sources

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