newmexicocoonass Posted August 10, 2019 Report Share Posted August 10, 2019 Hello all. I'm toying with the idea of mounting an RMR / viper / Holosun / Romeo reflex. Is there anybody making adapter plates that will bolt in place of the stock rear sight? I'm also considering milling the receiver to accept the sight. How much usable meat is there in the receiver? I'd like to get the reflex sight as close to the boreline as possible. My goal is use in PCC competition. Crazy, yes. I'll probably have a stroke trying to run a stage with it. But fun. I'm planning on SBR, mag catch, EZ Pull, trigger/reliability work and LOP mods. Thanks for letting me in the boards, and I look forward to your advice and thoughts on my crazy idea!! El QNMCA Link to comment Share on other sites More sharing options...
95mustang Posted August 10, 2019 Report Share Posted August 10, 2019 I wouldn't advise milling the receiver...there is not much metal there at all .Without looking up dimensions I'm going to say around .100 thou .And that's the end of the gun that takes a pounding from the bolt blowback...especially if you go with lighter pull springs. Link to comment Share on other sites More sharing options...
newmexicocoonass Posted August 10, 2019 Author Report Share Posted August 10, 2019 That's a good point... Probably smarter just to drill and tap. El QNMCA Link to comment Share on other sites More sharing options...
vanvock Posted August 10, 2019 Report Share Posted August 10, 2019 (edited) Welcome aboard. I wouldn't do any milling back there either. Making a plate yourself isn't very hard. I made one from aluminum to raise it for sighting in. Use the original sight as a pattern to cut - drill a piece of flat stock then mark that to drill for the new sight. If new plate is the same thickness you can re-use the original screws. Edited August 10, 2019 by vanvock Link to comment Share on other sites More sharing options...
newmexicocoonass Posted August 11, 2019 Author Report Share Posted August 11, 2019 Good advice, thanks. I'll be comparing sights this week, and things will be clearer then. Link to comment Share on other sites More sharing options...
giantpune Posted August 11, 2019 Report Share Posted August 11, 2019 I made one for myself. Just a small plate I cut from aluminum. Screws in place of the factory rear sight and is just thick enough for a reflex sight. It sits just high enough like this to see over the suppressor. Its lower than the factory sight line. Link to comment Share on other sites More sharing options...
newmexicocoonass Posted August 11, 2019 Author Report Share Posted August 11, 2019 That looks like what I'm after, and maybe even some protective ears to disguise the sight. Most likely I will not be running a suppressor.I did see one kind of reflex sight that had a channel in the housing to allow use of the stock sights. Link to comment Share on other sites More sharing options...
giantpune Posted August 11, 2019 Report Share Posted August 11, 2019 That looks like what I'm after, and maybe even some protective ears to disguise the sight. Most likely I will not be running a suppressor.I did see one kind of reflex sight that had a channel in the housing to allow use of the stock sights.The factory sights are pretty high. The DeltaPoint has an option to come with a built-in rear sight. If you made your mount on the thompson tall enough (or trimmed the front sight shorter), you could get this lining up. https://www.leupold.com/gear-and-accessories/accessories/deltapoint-pro-rear-iron-sight Link to comment Share on other sites More sharing options...
vanvock Posted August 11, 2019 Report Share Posted August 11, 2019 @ giantpune-- Love your Tommy-- The couch is nice too! Link to comment Share on other sites More sharing options...
newmexicocoonass Posted August 12, 2019 Author Report Share Posted August 12, 2019 That looks like what I'm after, and maybe even some protective ears to disguise the sight. Most likely I will not be running a suppressor.I did see one kind of reflex sight that had a channel in the housing to allow use of the stock sights.The factory sights are pretty high. The DeltaPoint has an option to come with a built-in rear sight. If you made your mount on the thompson tall enough (or trimmed the front sight shorter), you could get this lining up. https://www.leupold.com/gear-and-accessories/accessories/deltapoint-pro-rear-iron-sight Link to comment Share on other sites More sharing options...
newmexicocoonass Posted August 12, 2019 Author Report Share Posted August 12, 2019 Wow that's cool !!! Link to comment Share on other sites More sharing options...
newmexicocoonass Posted August 17, 2019 Author Report Share Posted August 17, 2019 Progress. Drilled & tapped a BRP picatinny adapter so I can use the rail or red dot. No extra holes in the receiver. EZ Pull kit is in, and smoothed out the trigger as per another post I found here somewhere. Modified the frame catch and added a trigger overtravel stop. Flared the mag channel. I was hoping to shoot it at the local match tomorrow, but it'll have to wait til I get some more mags!! NMCAEl Q Link to comment Share on other sites More sharing options...
giantpune Posted August 17, 2019 Report Share Posted August 17, 2019 Progress. Drilled & tapped a BRP picatinny adapter so I can use the rail or red dot.In my experience, drilling and tapping for the screws isn't enough. Even though the thompson isn't a heavy recoiling monster, it still shook enough to allow my red dot to shift. I had to add some roll pins to go into the 2 holes in the bottom of the red dot to act as recoil lugs. Link to comment Share on other sites More sharing options...
newmexicocoonass Posted August 17, 2019 Author Report Share Posted August 17, 2019 Shot it at the range today. When I got the Viper dialed in, the red dot was sitting on the back of the front sight !! Now I've got the picatinny back on the adapter plate, and the Viper on its mounting plate. Will try it again manana 👍 Link to comment Share on other sites More sharing options...
newmexicocoonass Posted August 19, 2019 Author Report Share Posted August 19, 2019 Good to go now, here is the M1 with the BRP picatinny adapter and Vortex Viper installed, trigger polishing & overtravel, and modified mag channel & release. Now, considering barrel options to lighten it up some. NMCA Link to comment Share on other sites More sharing options...
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