Let me elaborate further - when are you in a situation where by the time you expose the rear of the mechbox (in the case of an AR15 platform - when you have the mechbox completely removed) where you would want to ONLY swap springs? I'd imagine any competent or diligent gunsmith would want to open up the mechbox to inspect the internals for wear and re-lubricate the mechbox at that juncture. Especially if you've spent the time in removing the mechbox - which in some cases such as ambidextrous-controlled bodies (VFC KAC series) is actually more work than opening the mechbox itself.
Having said that, I recognize that there are now metal bodies which allow the rear of the mechbox to be accessed - but so far they have been very poor executions of the idea with janky dimensions and markings.
Last edited by Stealth; September 24th, 2013 at 09:15..
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