Page 5 of 5 FirstFirst ... 345
Results 41 to 47 of 47

Thread: Red dot screw part numbers and ordering info

  1. #41
    Site Supporter MD7305's Avatar
    Join Date
    Feb 2011
    Location
    NE Tennessee
    I got my slide back from my gunsmith today and he was able to successfully remove the sheared screw. He said due to the McMaster hardware being heat treated it was pretty difficult to extract. I asked him to chase all of the threads and now the hardware threads smoothly and easily, no hint of resistance.

    I'm probably going to take my second gun to the gunsmith and have him chase those threads as well. I see a big advantage using the McMaster hardware due to the added length and torx head so I'm glad to get this sorted out.

  2. #42
    Member md8232's Avatar
    Join Date
    Nov 2013
    Location
    In the Hills of Arkansas
    Quote Originally Posted by SoCalDep View Post
    Received another McMaster-Carr order on Friday. I ordered some of the 6-32 x 5/16" (Holosun - MOS) alloy steel screws and tested them on an MOS plate. The 5/16" screws flushed up perfectly to the bottom of the MOS plate - maximum thread engagement without any protrusion through the bottom. I'm happy with that.

    I also ordered M3-0.5 x 10mm alloy steel screws (part # 94414A714) for my Sig P365XL and Holosun 507K. I wasn't sure since I was going by the Romeo Zero instructions which don't list screw length, but 10mm matched the length of the screws that came with the Holosun perfectly. I test fit and (re)mounted the 507K with the new screws.

    I'm (based on Caballoflaco's excellent post above) revising my mounting procedure to include pre-fitting the screws without threadlocker to ensure they fit correctly. Therefore, my new steps are:

    1. Make sure pistol is empty
    2. Field strip
    3. Prepare all surfaces (slide, plates, screws, threads) by de-greasing.
    4. Test-fit screws in threads to ensure proper fit.
    5. Apply threadlocker to screws (preferably Loctite 248)
    6. Thread the screws until resistance is felt and then alternate slight increases in torque for each screw using a torque wrench to the lowest torque specification of any of the interacting components.
    7. Place indicator marks on the screws/plate or screws/optic with a toothpick to make it easier to identify a loose screw.

    After a near disaster yesterday and a couple weeks ago with a paint-pen, I will no longer apply the paint directly from the pen. I'll use a toothpick now just like I do with Torque-Seal. I apply the paint to one of the alcohol prep-pad wrappers that I've used and then use the toothpick. I'd be tempted to just get a couple small jars of Testers paint, but having to stir them may be more of a pain compared to shaking the paint pen.
    I have a 365XL on the way and will move one of my Holosun 407Kís over to it.
    How have the screws you ordered held up?
    How can you govern a country which has two hundred and forty-six varieties of cheese?

    Charles de Gaulle

  3. #43
    Member SoCalDep's Avatar
    Join Date
    Mar 2016
    Location
    Between LA and Bakersfield
    Quote Originally Posted by md8232 View Post
    I have a 365XL on the way and will move one of my Holosun 407Kís over to it.
    How have the screws you ordered held up?
    I haven't shot the P365XL very much. In fact, a couple weeks ago I shot it for the first time since mounting the optic. I probably have around 200 rounds through it with no issues. Sorry I can't give you more difinitive information but I'm confident in them.
    Attached Images Attached Images  

  4. #44

    McMaster screw ordering

    Sorry if this has been gone over before, but for the dumb guy in the room, I want to order replacement screws from McMaster.
    What sizes do I need?
    Glock 19 Gen 5 with CH plate, Holosun 507C
    -Plate to gun screw size/part#?
    -Holosun to plate size/part#?
    Glock 17 gen5 with Leupold DPP pro MOS plate
    -MOS plate to gun size/part#?
    -Leupold DDP to plate size/part#?

    Thanks to all, still learning ref MRDS and trying to build up my spare parts bin.

    Steve

  5. #45
    Member SoCalDep's Avatar
    Join Date
    Mar 2016
    Location
    Between LA and Bakersfield
    Quote Originally Posted by Steve m View Post
    Sorry if this has been gone over before, but for the dumb guy in the room, I want to order replacement screws from McMaster.
    What sizes do I need?
    Glock 19 Gen 5 with CH plate, Holosun 507C
    -Plate to gun screw size/part#?
    -Holosun to plate size/part#?
    Glock 17 gen5 with Leupold DPP pro MOS plate
    -MOS plate to gun size/part#?
    -Leupold DDP to plate size/part#?

    Thanks to all, still learning ref MRDS and trying to build up my spare parts bin.

    Steve
    For the G19 with the C&H plate, youíll be using non-standard screws - 4-40 if I remember correctly for optic -plate, and I may be wrong. I havenít gone down that rabbit hole yet, but based on feedback Iíve received from several other departments coupled with my own experience I think I might look at some stronger fasteners. 10 in/lbs is on the low end for a lot of torque wrenches (where they are not as accurate) but I have had some failures of the screws as have others. Thatís not cool at such a low torque. Iím not sure what the plate-slide screws are other than they are metric M3 - Iíd have to go back to my paperwork to give more details.

    Your G17 should be using the supplied screws from Leupold if I am correct (I donít own a DPP any more, so grain of salt and all). I havenít found a fastener that is comparable to the dimensions supplied by Leupold, and with a very small sample size (most of the DPPs weíve used until recently have been direct milled, which is way different than the factory options) I wouldnít go any more than 15 in/lbs (Glock MOS spec is 13.3) on those screws. I have the MOS plate screw specs, but not with me and I donít want to trust my memory. Iíll post that when I confirm it.

    Similar to what I said in another post... thereís still a lot of learning to happen with this stuff. Sorry I donít have good answers for you, but, as you mentioned in your post, weíre all kinda the dumb (newbies) in the room.

  6. #46
    SoCalDep,

    Thanks for there response. I have x2 complete set of screws from CHPWS on order now, along with a cpl extra screws for the Delta point pro,
    those along with the Duracell 1632s and 2032s I ordered should be good for a "in case something breaks scenario".
    This thread is extremely helpful in allowing people to read what actually works and doesn't work for others.

    W/R
    Steve

  7. #47
    Site Supporter 1911Nut's Avatar
    Join Date
    Jul 2011
    Location
    Arizona
    Any chance we could make this thread a "sticky"?

User Tag List

Posting Permissions

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