Blitzkrieg Components Mbus Pro Tritium front sight problem

pidevildog07 · Mar 10, 2020

The front and rear sight are on the same plane but I run out of elevation adjustment on the front sight and it's still shooting 5 in low at 100 yards. Is it possible the sight post itself is too tall or maybe it goes from being a target sight picture to a combat sight picture?

https://www.blitzkriegcomponents.com/ProductDetails.asp?ProductCode=MPSFS10BTD

outrider58 · Mar 10, 2020

Can you grind away the bottom of the front sight post to stop it from bottoming out? Or do you think the tritium will disappear as a result?

3paul10 · Mar 10, 2020

Barrel bent, receiver needs faced, loose barrel nut?????

Alea Jacta Est · Mar 10, 2020

Did you ask Blitzkrieg?

pidevildog07 · Mar 10, 2020

Nnztg8r said:
Did you ask Blitzkrieg?

Not yet, seeing if it's a simple fix like outrider stated. I'm going to try it with the original sight post as well. If I have problems with that then I'll start looking at the gun itself.

pidevildog07 · Mar 10, 2020

3paul10 said:
Barrel bent, receiver needs faced, loose barrel nut?????

Loose barrel nut, no. Torqued to 60ft lbs.

Now, the receiver needing faced is going to have me buying a new upper receiver as Bcm uppers are manufactured thicker in the extension for the barrel to make it a tight fit and at the risk of damaging something in the process I did not re face the upper as I do to all my other uppers as a matter of course. You have to use a heat gun to expand the aluminum to insert the barrel extension in.

The barrel is from Criterion which from what I've read is a good company to buy barrels from so I'm hesitant to look at the barrel as the source. I guess I could roll it on a flat surface to see if it's straight?

3paul10 · Mar 10, 2020

Sounds like very good components and built well, so I doubt those are your issues...but always good to consider. Keep us posted on it please

3paul10 · Mar 10, 2020

Just thinking, is there any bent or non straight portion to the rail? What kind of rail is it?

pidevildog07 · Mar 11, 2020

3paul10 said:
Just thinking, is there any bent or non straight portion to the rail? What kind of rail is it?

It's a 12.5" Bcm qrf. It's a free floating all picatinny rail. Also, I forgot to mention, these are the offset version of the mbus pro if that makes any difference.

3paul10 · Mar 11, 2020

I would try a known working site set and see if you have the issue... I've never used off sets....

Alea Jacta Est · Mar 11, 2020

My guess remains that it is a known issue. I’m just guessing further but offsets tend to not be same as top mount. I’ve installed several Blitzkriegs. Almost all were in fixed sights. While that doesn’t help you per se, I had no problems with them. Not cause I’m a smith but more likely because that’s the application they were designed and built for...

A call costs nothing but a little time. The manufacturer has staff with expertise. Lord knows I’ve called a few and sent back this or that over the years to be fixed and or for me to be told, operator error.

Good luck.

Blitzkrieg Components Mbus Pro Tritium front sight problem

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