Both original Mk.6 guns I have are equipped with the bayonet standard. One has the studs for the telescope base. The Mk.6 didn't have a standard nose piece as shown in Vince's picture. They have a screw on nose cap that screws to the 16" barrel. An SBR is an NFA registered rifle/carbine with a barrel shorter than 16". The 16" barreled Mk.6 carbines imported to the USAicon had a dummy display barrel that bolts to the front giving it the look of a Mk.4 and also making it easy to display with bayonet fixed. Is yours a Wiselite conversion Vince? I ironed a few bugs from one several years ago for a customer. I thought they were nicely done and they were fairly inexpensive if memory serve.
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