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1/25/2018 7:38:29 AM
Posted: 3/6/2002 8:31:54 AM EST
I have an A1 upper (Bushmaster I think) and both rear sight aperatures are the same size. Is this correct or was one not drilled out?
Link Posted: 3/6/2002 8:41:40 AM EST
That is the correct site for the A1. If you look, one leg will be marked with a number (300?, sorry it's been many years since I've had my A1) and is the long range leg. It is drilled at a different height to adjust for range.
Link Posted: 3/6/2002 11:27:39 AM EST
One leg is marked with a 'L'. Use this aperture for zeroing at 25METERS (27yards 1 foot), and for shooting at 375M and beyond.

After zeroing you flip to the unmarked sight for a 250M zero.

This assumes you have a 20" rifle - ranges are different for the carbine.

As Jonnie pointed out both apertures are the same size.
Link Posted: 3/6/2002 11:28:03 AM EST
Yep, they are both the same size holes. The long distance aperture is marked with an "L".
Link Posted: 3/6/2002 11:53:02 AM EST
Oops...darn it....L....that's right...Well, don't I feel sheeeeeeepish.
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