The listing (and I haven't seen a blurb from Division Miniature themselves) and packaging indicates that this is an L7A2 barrel and then proceeds to indicate that it can also go on the M48 and M60.
While the M68 is developed from the L7, it's not the exact same. The primary difference is in the bore evacuator. Visually, the L7 has a raised flange on each end of the evacuator tube and the M68 does not. Now, the evacuator flange rings for the Division Miniature product are separate and can be omitted.
What I'm not sure of is whether the bore evacuator, less the flanges, is actually the same between the two weapons or are there dimensional differences that make one not a substitution for the other.
Visually, though, it's probably good enough, even if you are a bit of a perfectionist like myself.