Yes, that would be the easiest way of shortening or lengthening the rod slightly. S&W used to make three different length collars, a .150", a .179"(standard), and a .190", although I'm not sure if the different collars are still available. The collars could then be fit to the individual barrel length depending on the exact location of the locking lug's final position.
I'm assuming the collars were available for situations when barrels were turned back, etc.
Some lattitude is also available by "fine tuning" the business end of the locking lug itself.....and, it can be let-out some if needed, by opening the slot where the locking lug pin rides.
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Ret. LE, FA Instr, S&W Armorer
Last edited by armorer951; 07-12-2015 at 03:37 PM.
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