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Thread: Question: Sterling Mk 4 SMG extractor spring plunger and the center spring plunger

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    Contributing Member Steve762's Avatar
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    Question: Sterling Mk 4 SMG extractor spring plunger and the center spring plunger

    Questions on the Sterling Mk 4 SMG (L2A3):
    --Is the extractor spring plunger the same part as the bolt's center spring plunger?
    --Is the purpose of the center spring plunger at the rear of the bolt to retain the cocking handle in the center block?
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    A Collector's View - The SMLE Short Magazine Lee Enfield 1903-1989. It is 300 8.5x11 inch pages with 1,000+ photo’s, most in color, and each book is serial-numbered.  Covering the SMLE from 1903 to the end of production in India in 1989 it looks at how each model differs and manufacturer differences from a collecting point of view along with the major accessories that could be attached to the rifle. For the record this is not a moneymaker, I hope just to break even, eventually, at $80/book plus shipping.  In the USA shipping is $5.00 for media mail.  I will accept PayPal, Zelle, MO and good old checks (and cash if you want to stop by for a tour!).  CLICK BANNER to send me a PM for International pricing and shipping. Manufacturer of various vintage rifle scopes for the 1903 such as our M73G4 (reproduction of the Weaver 330C) and Malcolm 8X Gen II (Unertl reproduction). Several of our scopes are used in the CMP Vintage Sniper competition on top of 1903 rifles. Brian Dick ... BDL Ltd. - Specializing in British and Commonwealth weapons Specializing in premium ammunition and reloading components. Your source for the finest in High Power Competition Gear. Here at T-bones Shipwrighting we specialise in vintage service rifle: re-barrelling, bedding, repairs, modifications and accurizing. We also provide importation services for firearms, parts and weapons, for both private or commercial businesses.
     

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    Yes and sort of yes. The rear spring and plunger through is to prevent the cocking handle from rattling about. It is the slot in the casing that holds the cocking handle in the breech block. In the REAL mechanical world, the rear spring and plunger serves no real purpose. It was originally put there in order to use up existing early breech blocks that had a rear mounted striker.

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    --Is the purpose of the center spring plunger at the rear of the bolt to retain the cocking handle in the center block?
    If you’re looking at a “Stenling”, yes.

    A “Stenling” is an American combination of registered Sten receiver tube and a Mk4 Sterling “parts kit.”

    There was an abundance of fairly cheap registered Sten receiver tubes in the US. But US law prohibits narrowing the cocking slot. That meant they couldn’t be used to make Sterlings. But a very bright young man figured out if the block and cocking handle were drilled through, allowing the plunger to pass through, the widened cocking handle would be retained.

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