Peter, For some reason my computer will not reply to your email. Kevin Adams may be able to add some info. The early L1A1 recievers were good for many 1,000's of rounds before they stretched beyond the adjustment range of available locking shoulders. The FN FAL recievers gave out after about 100,000 rounds (usually 2 or 3 barrels) which is more than most shooters would fire in a lifetime. The L1A1 reciever is a bit light for heavy use and is one of the many reasons why the L2A1 automatic rifles were not very successful. A lot of experimentation went on at Lithgow during the early 1960's with different heat treatments and steel batches until they finally got it pretty right. The Aussie L1A1 rifles were made a bit softer to avoid this cracking (which showed up in the 1950's FN troop trials) and consequently stretched slightly with prolonged use. I was heavily involved in this, selling and repairing chopper guns and designing and making net guns. I have a selection of these old recievers which we replaced (the new ones have an R number inside the mag well) during the NZ 'deer wars' in the 1970's when the FAL's were the most popular gun for helicpter use. The original FN FAL rifles were a bit harder in the action and freqently cracked between the locking shoulder hole and the body pivot hole.
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