1377 red dot problem

[Hummer57]

I mounted a inexpensive red dot on my 1377 with a dovetail/pic rail adapter. I have the elevation dialed all the way up but it is still shooting 6” low. Windage moved 4” right without a problem. Is the rail adapter too high or red dot defected? Any ideas welcomed.

 

[Steveoo]

The key rule is only buy a high quality Red dot. The cheap ones in those moulded packs, sometimes free with guns are worthless.

Biggest problem is not the external build geometry which is fine, but the dot not correctly following what you do with the adjusters. That internal part needs to be of high quality.

 

[nervoustrig]

Sight height alone would not explain a 6” discrepancy.

The angles at play here—those of the barrel and the sight’s compensation—are so slight that it’s not practical for the layperson to measure them, and a laser boresighter would be next to impossible to use on a 1377. So…as a practical matter, I would say the best and perhaps only option would be to try another sight (red dot or scope) and see if the problem persists. 

 

[Hummer57]

I’ll send it back and try another brand.

 

[nervoustrig]

Oh, something I should have mentioned previously. If either the adapter or the scope mount has a recoil pin (stop pin), make sure it isn’t protruding slightly. That can cause this type of elevation symptom when there is no pocket for the pin to go into.

 

[ToddGeddes63]

I’ll send it back and try another brand.

I have had good results with the sig sauer romeo 5 reddot, on my ar15, and on my sig virtus pcp rifle. They mount good hold zero, the dot brightness is adjustable, for small profile. The sight comes with 2 mounting plates, one low one co-witness. 

Not the cheapest, but a good choise. 

 

[nervoustrig]

For what it’s worth, I have 3 different cheapies in the $20 - $40 range and they all work perfectly well. 

The only issue I can speak of relates to their use of opposing grub screws to lock in the windage adjustment. While zeroing, tightening them to the “leaving it here” torque shifts the POA very slightly, making a bit annoying to get set up for a precise zero. Some people would probably not even notice. For those that do, it’s just a one-time thing so not really a big deal. Otherwise, the adjustments all work fine and have enough travel for zeroing anywhere in the 10-30y range at least.

Bear in mind it takes more adjustment range to zero at a close distance like 5yds vs 10yds.

 

[Odoyle]

Just shim the rear under and or in between the rail adapter simple!