I have an older 6 shot blued M17. This is a full lug model around the Bangor Punta era. Awesome and accurate firearm. Bluing is very good; as well as, the action. I really didn't shoot it much, migrating to semi-autos. On a whim, picked up a ten round 617 simply because it matched the round count of the majority of my semis. Glad I did. It's a very accurate firearm and the action is a smith (didn't take much to smooth it up). The only obvious difference I notice between the 6 vs. 10 is lock up time, which is understandable.