When you say swivels, I assume you are refering to the studs attached to the firearm, the swivels themselves usually are supplied with the sling. There is a Contender kit made by Uncle Mike's that includes everything needed to sling a Contender pistol including a new grip bolt that has the sling stud on the end of it. This kit has been hard to find at times. I would start by checking with Brownels. Also available is a sling made especially for the Contender pistol called "Just Sling It". It was designed by Southern Utah, a contributing member at GBO and has a quick adjust feature which allows a quick and quiet adjustment from carry length to shooting length. I think it is available at E. A. Brown, which may also have the above mentioned kit, I'm not sure
I have used nothing else on my Contenders for many years. The sling used in conjuction with a shooting stick makes for a very accurate shooting platform IMO, especially when moving about the woods squirrel hunting.
Can't address the "match" barrel question since in all the 22lr barrels I've had over the years, none were "match". I will say that all of the TC 22lr barrels I've had were good shooters and the two I have currently(a 10" and a 16")are absolutely wicked accurate. Like all 22's the TC's are picky about the ammo you feed 'em.
Love squirrel huntin' with my 22 'Tender

, AND, it'll soon be time!!! Can't wait! I can taste the biscuits and gravy already.....YES!!
Walt