Holosun 3x Magnifier

[WingDings]

[FNGGlock]

I got the 510 and added the 1/3 co-witness spacer on it. Without the spacer it was full cowitness on my M&P 15. The 3x magnifier comes with a spacer for 1/3 cw. Lines up fine with the spacers on both. Without spacers they are full cw.

The spacer are about 1/4” though.
On my M&P I had to remove the rear MBUS to fit the 3x

[WingDings]

Thanks.