View Full Version : Inch vs. Metric
December 29, 2001, 22:18
What is the differance between metric and inch when it comes to h/t/s. I have a century on an imbel upper with an "AD" prefix lower. If I replace h/t/s do I need inch or metric?
December 29, 2001, 22:22
You have an Australian (Inch) L1A1 lower. You need Inch internals: they are NOT interchangeable w/ Metric.
Send me your SN and I'll tell you the smallest bit of history about the lower/kit.
December 29, 2001, 22:23
If your lower is marked "AD" in the serial number prefix and your pistolgrip has a metal strap and is held on with a screw and not a nut from the bottom of your pistol grip,I would say you need a Inch Hammer,Trigger and sear set.HTH
December 29, 2001, 22:48
I just checked the sn on my lower and it is not AD it is ZA22837. Btw how do you tell a chrome bore or chamber from non?
December 29, 2001, 23:00
If the lower is ZA marked in the serial number area and it has a hollow pistal grip and the pistal grip is held on by a nut from the bottom of the grip then you will need a Metric trigger,hammer and sear set.HTH
December 29, 2001, 23:01
I think you have a South African R1 lower.
Chrome will be self evident: silver-gray haze covering the bore/chamber, and usually runs out a little onto the breech face and muzzle.
BTW- it's METRIC.
[ December 30, 2001: Message edited by: EMDII ]
December 29, 2001, 23:02
ZA is South African, either FN, SA or Imbel made. Which would make it metric, verify by pistol grip attachment and buttstock to lower mating.
On chrome bores, at chamber you will see the chrome as a satin type silver coating at outside of chamber mouth. Usually can see same at muzzle if its not just chamber chromed.
December 29, 2001, 23:04
Beat me by a minute Ted, Ha! :D
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