Trials No.4 Rear Sight

[EarlyFours]

According to Skennerton, after Dunkirk the No 1 Mk VI and No 4 Mk 1 rifles used in the
trials during the '30s were removed from storage and sent Enfield for refurbishment. There
were 2 types of rear sights on the No 4s, the first which used a ball and spring detent
mechanism, and the second a plunger and spring detent mechanism. During the refurbishment
was the detent mechanism upgraded to the plunger and spring, or left as it was ??
In particular, were any of the rifles coverted to Snipers left with the ball and spring ??

Information

Warning: This is a relatively older thread This discussion is older than 360 days. Some information contained in it may no longer be current.

[Peter Laidler]

I can tell you that 6 No4 trials rifles were returned to their ancestral home, deemed suitable for conversion to L42 specification. 4 were rejected because the backsight configuration, indicating a ball and plunger or just a rounded plunger could not accomodate the standard No4 backsight that was necessary in order to standardise the L42.

Those 4 were rejected and only two former trials rifles were converted to L42 specification. Both the remaining two rifles are known to this forum.

So the answer to your question is that certainly 4 ball and spring or rounded plunger type backsighted trials rifles were converted to T rifle spec. On that basis, then probably many many more were too

[RJW NZ]

My 'favorite' topic, but I see a fair question. My 1930/V1 came without a rear sight so I don't know what the set up was. Are there any features on the receiver that might reveal if its set up for ball or plunger? ie hole diameter/depth. There is something odd about this hole on mine, some plungers fit, others don't. Thanks R

[Enfieldlock]

The very first off No4s assembled at Faz (1940/41) from components made at RSAF in the mid-30s still used the ball and spring set up. However the Enfield made sight was 6-click to a complete turn as opposed to the original four click job. Serials had an "A" suffix.

[Thunderbox]

My 'favorite' topic, but I see a fair question. My 1930/V1 came without a rear sight so I don't know what the set up was. Are there any features on the receiver that might reveal if its set up for ball or plunger? ie hole diameter/depth. There is something odd about this hole on mine, some plungers fit, others don't. Thanks R

If you look at the part of the receiver that has the hole for the plunger/ball, the rifles fitted for the spring & ball have about 1/16" more metal. This is why, if you fit a standard Mk1 rearsight and plunger, the sight will not rotate, but simply jams on the plunger.

[Peter Laidler]

Presumably on these rifles (the one shown in Thunderbox's picture), you just need to remove the plate part of the plunger and round the plunger off - or cut the plunger short and insert a .2" ball to 'cure' the problem.

This wasn't acceptable for the L42 as the MoD required standardisation and not a mix and match

[Surpmil]

So presumably two of those No4(T)s were built on Model C trials No4's, or were more bodies/rifles converted to that spec. than just the 57 referenced in The British Service Lee?

[Peter Laidler]

Is that a statement or a question Rob? If it's a question that relates to the L42's, you'll have to elaborate please.............

[Peter Laidler]

L42 BACKSIGHT ASSEMBLY (shown on right), fresh out of the original Ordnance wrapper dated 1980. Nothing out of the ordinary that your average Joe would notice until it’s compared with the standard .303” No4T backsight on the left. Now notice that the index line on the sliding cursor is lower down the scale. In fact, it’s .070” lower down the scale which ensures that the 7.62mm rifle can use the old .303” yards leaf SCALE if used in conjunction with the 7.62mm calibrated cursor and using METRES instead of the old YARDS.

Good in theory but flawed in practice when after a couple of hundred yards, it equated to, well, nothing really. But if you zero your L42 in at 300 metres – or yards, using the new fangled iron sights, you can be assured a body hit at between 100 and 600 metres….., or is it yards?

Attachment 18595



L42 BACKSIGHT CURSOR.
Because the 7.62mm L42 backsight sliding cursor (on right) differs from the standard .303” rifle part, it is distinctly marked M for METRES/METRIC so that the unwary will easily spot the difference. Many L42’s now in private hands unknowingly have standard No4T backsights fitted.

Attachment 18597


There again, in close up. The distinct difference between the cursor index marks are clearly shown. Don’t think that new cursor slides were made for the L42 programme. No, old stocks of sights were stripped. The old and worn out were replaced and the cursor index line filed clear and re-marked with a lined punch and then re-assembled.

Full standardization was required for the L42 programme and this ensured that any rifle that was unable to conform to the spec, such as those few Mk1/2’s (and maybe 1/3’s) or trials rifles that would not accept the standard L42 backsight were sifted and rejected out of hand.

Attachment 18596

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[xa-coupe]

Very interesting and informative Peter. I can only imagine what a real L42 sight would cost even if one could be found. I think I will just put a 303 no4T sight on my L42 clone to be.
I understand there is also a modification to the sight to allow the bolt to be taken out with the sight down ( for obvious reasons ) are you able to show us that Peter ?