This is probably going to give a slight headache Damien. No serial number on the barrel!
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Matty, not sure what the letter code is on this H barrel as per Muffett's post, but that may assist if you can find it. It has the look and feel of a 1950s club rifle, being parkerised as pointed out before. Is there a rearsight bed, and if so, how professionally has it been fitted?. The bruise on the edge of the knox form indicates a barrel that has not been fitted up in a proper vice, so again lends weight to it being installed by what passed for the club armourer. Many of the club armourer fitted barrels did not have serial numbers.
As an aside, the rearsight bed can be very telling - if the barrel has been made as a rifle club spare, it will probably be parkerised under the rearsight bed, the rearsight bed will have a different finish to the barrel, or there will be a longitudinal hacksaw cut along the bottom of the rearsight bed's band so it can open out and fit the larger diameter H barrel. My understanding is that original WW2 production H barrels were assembled with the rearsight bed "in the white" and then parkerised is a unit, if not as the whole barreled action. But again, someone more knowledgeable may educate me on that point.
I have a theory that the barrel may have been a spare left over from the sniper program judging by the date, as I cannot see the MA VII stamp that goes on both barrel and receiver ring on barrel fit up. So the barrel is a spare made and proofed in 9 '44 as a spare pending fitting to a Mk.3H(T). Club armourers would have not put the MA VII stamp on, as they were not factory inspectors. When I can drag out my own Mk.3H(T), I will compare the date and inspection stamps to test my theory. I am struggling to recall whether my sniper had a numbered barrel, but the date was consistent with the butt marking and the list in Skinny's books.
The coincidence between the barrel date and the butt FTR might be just that. Rifle 54021 should be a 1916 Lithgow made in Nov - Dec 1916 and issued to 5MD in 3/17. Does the butt have the same 5MD rack number, or is it a completely different butt from the FTR mix & match? I am not sure why Lithgow would be rebuilding this rifle as a Mk.3H in Sept 1944 when they were in the earlier stages of the sniper program. One possibility that crossed my mind is that it was fitted with the H barrel as part of the sniper program, but was not completed.
Sorry, you have really got me on a tangent now. The problem with that is the lack of MA VII stamp and the thought that they would have finished completing it into a Mk.3H(T) being relatively early in the program makes me think the barrel was not installed at Lithgow. The whole assembly sequence does not seem to gel with my understanding of it (but I could be wrong). I have never yet seen a Mk.3H(T) that had its original 1930s H barrel - only with new 1944 barrels so far. This suggests to me that the Mk.3H rifles used as the basis for the snipers were selected for reasons I am not clear on. Was it that if they were proven target rifles, then they must be OK for accuracy? We know that many (most?) of these rifles were largely broken down to receiver only before being rebuilt with new parts, so why bother?? That said, I have seen a few original snipers that use woodwork that appears to be original to the unconverted 3H rifle.
Anyhow, a good 5MD issue mark. Not too often seen....