M305 Short barrel Smith Enterprises gas block sight.

[bluegrizz77]

Who has used the Smith Enterprises gas block sight from site sponsor Nordic Marksman part number 440-2011-M305? The reason I ask is in the description it says it's used on the short barrel USN rifles 18". The actual height of it measured by Nordic as I was on the phone is 2mm higher than the one the short barrel non M305 threaded sights (SAE). It's the same height as the ones used for the 22" barrels, does it work fine with out major rear sight re-calibration or have you guys changed front sight heights?

 

[L42A1]

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[bluegrizz77]

I asked asked Nordic and they only carry the one dovetail M305 thread gas lock sight. They say I was the first to ask about height, people just used it and he assumed it worked fine. I'm just wonder before spending the 155 dollars.

 

[bluegrizz77]

Has anyone zero'd their 18" with the higher sight? How'd it go?

 

[ipscgraz]

I have two M305’s that started with 22 inch barrels. I had the barrels cut to 18.5 inches (Dlask) and I had to file down the existing front blade on both rifles, otherwise the rear aperture was way above the sight protector ears.

And a substantial amount, around 0.045”.