I just accidentally erased everything I typed. G2 barrels fit original Contender frames as well as the new G2 frames. As long as it's not an unmodified Armalloy barrel you can put any barrel on any blued or stainless frame. E. Arthur Brown Company lists their own EABCO Custom Shop and Thompson Center Arms Contender barrels for sale but they're out of all 18 TCA brand.
https://www.eabco.net/TC-Barrels_c_2693.html?sn=165308772&e=cor&ajx=1&nsrt=NAM_A0&ontd=2&tag=XIDSC2693 They'll make you a custom pistol barrel 9"-15" long in .17 HM2, .17 HMR, .17 Hornet, .17 Ackley Hornet, .17 Ackley Bee, .17 Bumble Bee, .17 Hee Bee, .17 Fireball, .17 Mach IV, .17 Rem, .20 Tactical, .204 Ruger, .22 LR Match, .22 Stinger, .22 WMR, 5.7x28mm FN, .22 Hornet, .22 K Hornet, .218 Bee, .218 Mashbrn Bee, .221 Fireball, .222 Rem, .222 Rem Mag, .22 PPC EABCO, .223 Remington, .223 Rem Wylde, 5.56 NATO, .223 Rem Ack Imp, .219 Donaldson Wasp, .224 Valkyrie, .224 BR Mag (BRM), .225 Win, 6mm PPC EABCO, 6mm Donaldson Wasp, 6mm BR Mag (BRM), .25-20 Win, .25-35 Win, .25-35 Win Ack Imp, 6.5mm US (Ult Silh), .264 LBC- AR, 6.5 BRM, 6.8 Rem SPC, 7mm TCU, 7mm US (Ult Silh), 7-30 Waters, 7 BRM, .30-20 Match Silh, .32 H&R Mag, .300/.221 Rem, .300/.221 Rimmed, .300 AAC Blackout, .30 Herrett, .30-30 Win, .30-30 Win Ack Imp, .300 BRM, .30-40 Krag (.30 US), .30-40 Krag Match, .38 Special, .357 Herrett, .357 Mag, .357 Rem Max, .35 Rem, .375 Win, .44 Rem Mag, and .45-70 Govt. What I don't see on the list is .45Colt or .45 Colt/.410.
https://www.eabco.com/ Earlier this week I found some Contender barrels and stocks and things at Sharp Bros I wanted to start a thread on but didn't get around to yet. They say Find @ Optics Planet (Click Here). I just checked and I can't believe it, they say they have a blued .45 Colt/.410 bore 14" vent rib barrel in stock for regular price $617.99 (Save 36%) = $393.99. Plus they're honored to offer a Military Discount to anyone who is serving or has served in the US Armed Forces, Law Enforcement, or as an Emergency First Responder. The 12" G2 barrel is out of stock. If you want a used stainless steel 14" vent rib barrel let me know. I'm not asking $800 for mine. I haven't shot it since I bought a 10" with regular sights and no rib.
https://sharpsbros.com/contender-barrels-various/