Yes, if weight is a concern you will enjoy the Accura MR more. Its also offered in a nitride finish over the stainless barrel. The Apex has one other minor draw back vs the Accura MR. The Apex does not have a firing pin bushing. The bushing in the Accura MR can be adjusted to take up some primer head space with a cheap shim kit. Properly adjusted/shimmed it will be virtually blowby free.
Accura MR SS 6.35 lbs. Total Weight
Apex SS 8 lbs. in Muzzleloader
As you can see, they look nearly identical.