I suspected the barrels were interchangeable.
RagePrblm - it's WetfootWilley's fault! Thanks to Willey for not making me revive this thread
Tanguss999 - I have some other pumps (Rebline and Razorback III) that I use and really love, what I want out of the SL-68 is simple, reliable, and reasonably accurate. I think I can get a J&J at the price point you mentioned. I figure if slip-and-squeeze barrel mounting is good enough for the Palmer Blazer, it is probably good enough for my SL-68.
Of course that takes me down a different road. I COULD get a Palmer barrel for it, but they are a bit costly. $150 for a 12", 0.685 bore, dual spiral-ported, naked brass barrel with wedgits - I think the Palmers have confused Brass for Gold.