« Reply #2 on: April 16, 2012, 03:31:08 PM »
IF the back of your receiver is skeletonized, see pic in the FAQs or on the HR1871 website, then it is an SB2. The fact none of your barrels will lockup properly on it means nothing regarding the type of the receiver. The "problem" is because of manufacturing tolerances the receivers and barrels are all just a tad different and either one lucks out with a barrel purchase and it fits an existing receiver or as in your case it doesn't fit. It does not mean there is anything wrong with the receiver or the barrel.
BB

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RIP Tom: Tom Nolan, ( bikerbeans) passed away this afternoon (02-04-2021).
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