I'd like to try that flip-up cap to use my TA31 as an occluded sight. I remember it being mentioned on one of the threads a year ago that it can be pushed inside the objective bell, but I can't find it in Search. Anyone have one? What # cap is it?

Thanks.

Never heard of a model specifically for that scope.   It must have been made for a different scope and by coincidence fit in the Acog perfect.  

I found one reference to it in an archive search, but it didn't list which one actually worked.  The best thing would be to measure the inside diameter with a pair of calipers, then find the corresponding cover to fit.  The BC specs can be found here: BC Specs from Midway USA  You may need to go one side down to get it to fit inside though.

Hope this helps.

Quoted: I found one reference to it in an archive search, but it didn't list which one actually worked.  The best thing would be to measure the inside diameter with a pair of calipers, then find the corresponding cover to fit.  The BC specs can be found here: BC Specs from Midway USA  You may need to go one side down to get it to fit inside though. Hope this helps.

Aren't the BC specs for the OUTSIDE diameter??  BC wouldn't know how much tube was around a specific lens on a specific model scope, so how could they know how big to make the cover based on that?  

Any time I've need one, I measured the size of the scope's actual tube, and then matched it up.  It's worked fine so far.  

Who's your buddy???

"Eye piece diameter(sizes for the diameter of eyepiece end of scopes have a fit range of .01 under to .025 over these measurements)

   * Size 1: 1.341 in/31.1 mm
   * Size 2: 1.225 in/34.1 mm
   * Size 3A: 1.300 in/33.0 mm
   * Size 3: 1.388 in/35.13 mm
   * Size 5: 1.432 in/36.14 mm
   * Size 7: 1.457 in/37.0 mm
   * Size 9A: 1.341 in/31.1 mm
   * Size 9: 1.468 in/37.13 mm
   * Size 10: 1.516 in/38.5 mm
   * Size 11: 1.550 in/39.4 mm
   * Size 13: 1.570 in/39.9 mm
   * Size 14: 1.605 in/40.8 mm
   * Size 15: 1.66 X 1.45 in/42.2 X 36.8 mm
   * Size 16: 1.660 in/42.2 mm
   * Size 17: 1.675 in/42.5 mm
   * Size 18: 1.700 in/43.2 mm
   * Size 19: 1.730 in/43.9 mm
   * Size 20: 1.775 in/45.1 mm
   * Size 21: 1.70 X 1.42 in/43.2 X 36.1 mm

Objective diameter(sizes for the diameter of objective end of scopes have a fit range of .01 under to .025 over these measurements)

   * Size 1: 1.000 in/25.4 mm
   * Size 2: 1.221 in/31.0 mm
   * Size 2A: 1.181 in/30.0 mm
   * Size 3: 1.34 in/34.0 mm
   * Size 3A: 1.300 in/33.0 mm
   * Size 4: 1.095 in/27.8 mm
   * Size 5: 1.387 in/35.2 mm
   * Size 7: 1.429 in/36.3 mm
   * Size 9: 1.485 in/37.7 mm
   * Size 10: 1.500 in/38.1 mm
   * Size 11: 1.54 X 1.34 in/39.1 X 34.0 mm
   * Size 12: 1.76 X 1.53 in/44.7 X 38.9 mm
   * Size 13: 1.530 in/38.9 mm
   * Size 15: 1.558 in/39.6 mm
   * Size 17: 1.612 in/40.9 mm
   * Size 19: 1.646 in/41.8 mm
   * Size 20: 1.700 in/43.2 mm
   * Size 21: 1.735 in/44.1 mm
   * Size 23: 1.760 in/44.7 mm
   * Size 25: 1.800 in/45.7 mm
   * Size 26: 1.820 in/46.2 mm
   * Size 27: 1.840 in/46.7 mm
   * Size 28: 1.890 in/48.0 mm
   * Size 29: 1.919 in/48.7 mm
   * Size 30: 1.960 in/49.8 mm
   * Size 31: 1.998 in/50.7 mm
   * Size 33: 2.043 in/51.9 mm
   * Size 34: 2.100 in/53.3 mm
   * Size 39: 2.220 in/56.4 mm
   * Size 40: 2.250 in/57.2 mm
   * Size 43: 2.310 in/58.7 mm
   * Size 44: 2.360 in/59.9 mm
   * Size 45: 2.410 in/61.2 mm
   * Size 46: 2.430 in/61.7 mm
   * Size 47: 2.461 in/62.5 mm
   * Size 48: 2.500 in/63.5 mm
   * Size 51: 2.575 in/65.4 mm
   * Size 53: 2.600 in/66.0 mm
   * Size 53A: 2.640 in/67.1 mm
   * Size 54: 2.725 in/69.2 mm"

Quoted: Aren't the BC specs for the OUTSIDE diameter??  BC wouldn't know how much tube was around a specific lens on a specific model scope, so how could they know how big to make the cover based on that?   Any time I've need one, I measured the size of the scope's actual tube, and then matched it up.  It's worked fine so far.   Who's your buddy???

Well, you can't put a standard scope cover on the OUTSIDE of a TA31 series ACOG.  If you look at the picture, there is no way for it to fit.  


The objective is cut at an angle, and the bottom meets up with the handle mount with no real estate to hold on a scope cover.  That is why the BWhalen was asking about which one fit on the INSIDE of the objective, since that would be the only way to make it work.  It isn't a specific BC application, but there may be one that works.  I mentioned dropping down a size because the BCs are designed for an oustide diameter, and would have some extra circumference due to the material to make the cover.

I guess I should have read the original post more carefully...sorry.  

I should stay away from technial things 'til after noon, and after some caffiene.  

Quoted: I guess I should have read the original post more carefully...sorry.   I should stay away from technial things 'til after noon, and after some caffiene.

i was bored one day, so i cut the ears off my kill-flash for my ta01 and stuck a 03a butler creek  cap on it. a little trimming of the cap's ring to clear the hood was necessary. the result works well enough.

Thanks for everyone's replys, and the list of BC sizes. I think the best plan is to bring my TA31 to the gun shop, and ask if I can try a few until I find the one that fits. I'll post the size of the BC cap here if I can make it there this weekend.

Brian