I was looking for one and told i knew of the Seekins but a fellow told me of one at ar15haundguard.
For 23.00-+ i bought two to play with.
When it came in i went to the auto parts place and got a 2mm long allen wrench.
It went on easy and it was easy to adjust.
It is a .750 and a clamp on.this went on a 7.5in.pistol in 556 and worked first time.
Since them it has has about 150 rounds at a fast pace and i had no problems.
