Later L1A1 tech (workshop) documentation

[Bruce_in_Oz]

Do any old "gun-plumbers have the "late-issue" data for the L1A1 gas-port diameter and the "instruction about boring it out a few "number" sizes to keep the old girls chugging along until the various 5.56 replacements came on line. I am certain it was an approved practice / official instruction in that short time, . Some seem to doubt the existence of such an instruction, so I am throwing it open to the "Council of Elders".

I can find notes for several other "life-extension" instructions. Some personal notes may have been "misplaced" during several moves. Who knows

These other "instructions" included using a special "zinc-based" paste to better seal the gas-cylinder tube, , spot -welding the "riveting of various catch / latch assemblies, inserting "reinforcement "gussets" in the front of the trigger mech housing. Relieving the timber of the butt at the top of the wrist to reduce the chance of splitting. .

Probably other stuff i have forgotten.

[Frank LE]

Hi Bruce,

here the reference for reaming the gas port to stage 1 and 2 from EMER Regulations/Field Level Repair.

[browningautorifle]

Very interesting.

[Bruce_in_Oz]

I just received an email from a former "colleague" who tells me, as per the "instructions", that "if the gas vent in the barrel is "fouled", it is to be cleared with a "No. 42" drill bit.

I looked up the chart and it tells me that No 42 is 0.0935 inches or, 2.3749 mm.

But, he could not quote the the "last-ditch" oversized hole allowance.

I still cannot find all of my own notebooks, unfortunately.

Australian L1A1 documentation was in the D250 "decade" (series). The scan of D114 is a scan of an official document ; i.e.., a UK "Electrical and Mechanical Engineering REGULATION": a whole different family, but still a "rifle" reference. These were not something in my "system" back when I wore the "other" baggy green, down here in the Penal Colonies..

The Brit "numbers" for "adjustment" to the gas vent look 'reasonable" so I will file the excerpt in a sleeve in a ring binder for possible future reference. Perhaps something for a post-port game of "Military Mastermind"?