To the best of my knowledge, Hastings is out of business. TruLock has a full selection of Hastings threaded choke tubes.Thanks to Ralph McLaney and Marshal Kane I have a clear understanding and the thread change between Remchoke and ProBore. Spartan was ok with me as it is the Baikal system same as Tru-Choke .749 X 44. Concerning Hastings Replacement chokes these are difficult to get by mail order sellers. Is hastings going out of business or consolidating their activities?
The 1100 G3 and 1100 Competion, (introduced 2006). are slightly overbored and use Remington's Pro Bore series of choke tubes.remington 1100, 1187, 870 have the same threads, thus are interchangeable. I have all of these three guns guns and i dont see any problem with interchanging chokes in them. However there are highly priced chokes from other aftermarket manufacturers you might want to get your hands with.
I think Ralph's correct. The Pro Bore choke tubes that came with my 1100 Competition will not even begin to thread in my son's older 11-87 Trap model. Perhaps determined by date of manufacture, some will interchange but in my case they definitely do not. Hence, my response that one can only try interchanging and hope for it to work.The 1100 G3 and 1100 Competion, (introduced 2006). are slightly overbored and use Remington's Pro Bore series of choke tubes.