Enfield No4(T) "Trials Rifle" scope brackets

[KARLOS]

As information on Trials T rifles is a little scarce, it took a while to find this out , however please correct me if i am wrong . Some ( most ? ) trials rifles under went an improvement program. These rifles will have the original date of manufacture over-stamped 1933. At least 3 things have been changed. firstly the bolt was changed for one of a higher grade of steel and as Peter has stated it has a steel batch number . ( Were there different batches ?) Second the rear sight elevation screw was changed from 4 to 6 clicks per turn and then the cocking piece was changed from a side locking cross screw to the standard rear locking screw. I am not aware of any other changes. A couple of years ago i managed to examine a trials rifle a 1931, date not over-stamped , side locking screw on cocking piece and 4 click rear sight screw, no SBN number on the bolt, which had matcing number and Enfield markings, it looked completely original to me. unfortunately original cut off and for-end were gone. Can any one explain the SBN on the bolt, as the bolt/locking design is virtually the same as a No1, the metallurgy should have been sorted out years earlier.
As for my rifle,will remove butt and check for number , and take a few more pics of mount, will post asap but am on mobile broadband and my upload speed is about 30 mins per pic and this is really testing my patience.

Information

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[Surpmil]

As information on Trials T rifles is a little scarce, it took a while to find this out , however please correct me if i am wrong . Some ( most ? ) trials rifles under went an improvement program. These rifles will have the original date of manufacture over-stamped 1933. At least 3 things have been changed. firstly the bolt was changed for one of a higher grade of steel and as Peter has stated it has a steel batch number . ( Were there different batches ?) Second the rear sight elevation screw was changed from 4 to 6 clicks per turn and then the cocking piece was changed from a side locking cross screw to the standard rear locking screw. I am not aware of any other changes. A couple of years ago i managed to examine a trials rifle a 1931, date not over-stamped , side locking screw on cocking piece and 4 click rear sight screw, no SBN number on the bolt, which had matcing number and Enfield markings, it looked completely original to me. unfortunately original cut off and for-end were gone. Can any one explain the SBN on the bolt, as the bolt/locking design is virtually the same as a No1, the metallurgy should have been sorted out years earlier.
As for my rifle,will remove butt and check for number , and take a few more pics of mount, will post asap but am on mobile broadband and my upload speed is about 30 mins per pic and this is really testing my patience.

Your bolt is original I believe. My 1933 No.(T) had exactly the same marking under the bolt handle, and I am quite certain the bolt was original.

The MkI cocking pieces that have a cross screw are of the pattern made for the NoI MkVI. Both types are seen on No4 MkI trials rifles. There appears to be no correlation with serial numbers or dates that I am aware of.

Acc. to The British Service Lee, in 1935 57 rifles were made up as the Model C trials pattern, with alloy buttplates, the backsight of the later accepted pattern using a plunger rather than a ball to lock in position, sling swivel on the guard etc. (I had one of these, No.A195-)

AFAIK, the backsights were not changed on the pre-1935 rifles as they were unique to those rifles and the later pattern could not be fitted unless the slot between the sight 'ears' was milled deeper to allow room for the plunger that replace the ball bearing used earlier. On my rifle mentioned above, this area was 'in the white' showing that the body had been modified from the original trials pattern, as this was the first pattern of rifle to feature the type of sight and detent plunger later standard on all No4s