There is a small steel pin in the axis of the B.A.D. short throw selector. This is to prevent installation into normal AR-15 lowers with standard 270-0-90 degree selector markings.
Why? Because when set to Fire, the Short Throw selector doesn't actually point directly at the 90 degree position. It sits at 45 degrees. For an unfamiliar user it doesn't point to 'Fire', but it WILL fire. Liability reasons.
15 minutes with a file will take it off.Disclaimer - The 45 degree 'Short Throw' A.S.S. will NOT fit standard AR-15 receivers without modification. Modification of the safety voids all warranties expressed or implied. Buyer assumes all other responsibility for any loss, damage, or injury to persons or property arising out of, connected with, or resulting from the use of these products, either alone or in combination with other products/components.