MP-15, 5.56 or .223 only

[jpmp15]

only markings on barrel is .223 1/9 ?

 

[oneyeopn]

I will bet it is a cut down 18" barrel or 20" with the standard chrome lining and the 1:9 twist. Most of their rifles used to have the 1:9 twist until they found out what a score the Sport barrel is, they have since started changing some of them over. A 17" barrel is an odd duck but you are concerned with the chamber size. everything else would pretty well be standard.

 

[jpmp15]

thanks for input on 223 and flash info think i will leave stock!happy shooting from Canada!