« Reply #2 on: August 16, 2009, 02:45:25 AM »
There have been many different RSx packages offered by various retailers, and not all of them had dual calibers. I remember seeing the RS1 as a .177 only in Walmart well over a year ago, so it is very possible that it was sold with only one barrel.
I have never played with that version out of the box, but the dual caliber I did get to mess with had a set screw in the breech block that secured the base of the barrel. This allowed the switch to the other barrel. It's unlikely they welded the single caliber version in, and it might be threaded. It may also be press-fit but that would be odd.
PS: Welcome to GTA! Now that you have some guns, keep us posted. I have an RS2 Beeman SS1000 in .177, with the adjustable trigger, and it is a good and strong shooter. They are pretty well made as Chinese bargains go, and show up under all different brands, models, and combo variations.
You can fix your non-adjustabletrigger up some with some careful honing and polishing. Or, you could gift it out and we will help you spend your money on something else. That's what we do here!

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Steroid Sheridan rocker, Daisy 990, SS1000, B26-2, QB-57, Crosman 150 (TW), Crosman 1377 x 2, RWS5G, MP513, IZH53, RWS9N/Cometa, MP661k Drozd, Walther Falcon Hunter, RWS 34 Panther, XS-B3-1, Cummins B3s, RWS94 Cometa x 2, RWS48, Beeman R7, Daisy Avanti 853, RWS92 Cometa 220, Beeman P3, IZH-46M x 2, Daisy Avanti 747, Diana 24, B5-10, BSA Lightning .22, Crosman Marauder #39 .22, Crosman 1322 Phase 1, Diana Model 20, HW70, Shin Sung Dragon Slayer .50, Haenel Model 26, Slavia 620, HW45/.177