Quote:
Originally posted by Lebell
The cheater's way is to use a drop in auto sear or DAS. This is a little hunk of machined metal that, when dropped in the trigger group, makes the gun fire full auto when the trigger is pulled. Taking the DAS out returns the gun to semi-auto fire.
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Some manufacturers made the AR-15 lower with the spot for the DAS filled in so you couldn't just drop one in without machining it out.
Also when the AWB went into affect, some manufacturers changed the way the bolt carrier was made. The new bold carriers had a shorter piece in the back to keep it from collapsing. This would also cause the bolt carrier to hang if a DAS had been placed in the weapon.