Rate of twist for the BCL MRX Bison 5.56NATO with 12.5 inch barrel

[Ivan Smythe]

Does anyone KNOW the Rate of twist for the BCL MRX Bison 5.56NATO with 12.5 inch barrel
Thank you,

I.

 

[FatCatsDad]

1:7

 

[beltfed]

My 16" model started with a 1:7 and they changed out to a 1:8 under warranty.
Best to check with BCL though.

 

[easy]

Measuring twist yourself is fairly simple and accurate.
Use a bore brush on a cleaning rod. Insert brush and rod into the barrel a short distance and mark the starting point on the rod.
Complete one full revolution of the rod as you push it forward and mark the end on the rod. Remove rod and measure the distance in inches between the two marks.

 

[ZeroStop]

Anyone know the twist rate of them in 7.62x39 and 300 blk?