STBA™ - STAINLESS TRIGGER & BUSHING ASSEMBLY for AR15/M16
Now you can have black nitride precision CNC machined Hex Head STAINLESS STEEL hammer and trigger pins on STAINLESS STEEL bushings in your new Tactical Innovations lower receiver or you can easily retrofit your existing receiver so you never have to worry about pin wear in your AR15/M16. Each
precision machined pin is .154 diameter for a perfect no wiggle fit in the mating left and right side bushings.
We don't know how you could ever wear out a stainless steel bushing,
but if necessary, the stainless bushings are threaded into the receiver
and can easily be replaced. Both the side bushings and the hex head hammer and trigger pins are black nitride finished for appearance as well as hardness and durability.
Our AR15/M16 STBA™ assembly consists of (2) right side bushings, (2) left side bushings and 2 non-rotating .154 diameter hex pins.
Our stainless steel bushing set is available factory installed on both
our T15™ forged receiver as well as on our T15BDX™ Billet Deluxe
receiver. The bushing and pin set can also be purchased here as a
retrofit that can easily be installed on existing receivers with the
optional STBA™ INSTALLATION KIT.
Although you could have a professional machinist or gunsmith do the installation, its not necessary. Retrofit installation requires the hammer and trigger pin holes to be drilled and tapped to 1/4x40 to allow the bushings to be threaded into the receiver. Obviously, once you install stainless steel bushings in your receiver you would not be able to later use standard hammer and trigger pins (and would have no reason to ever want to). The installation is not technical and takes only about 5 to 10 minutes. Due to manufacturing demands, we are unable to accept customer shipped receivers for the STBA™ retrofit and you should refer the project to your local gunsmith if you don't want to complete the retrofit yourself.
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For installation of the STBA bushings, all you would have to do is accurately drill the existing .154 holes on the same center point using the #1 drill bit. Its important to make sure that you don't wobble or similar and make the holes oversize. Then with a hand tap and some tap oil, use the 1/4-40 tap to carefully hand tap the holes.
Next you will want to thoroughly clean the holes with acetone or similar to remove all oil and residue. Then blow dry and apply some red locktite and using the installation tool or allen wrench as appropriate, screw the bushing into the threaded holes being very careful not to cross thread them. We don't have a torque spec other than tight but not to the point that you damage the threads, the bushing or the tool.
Allow
the locktite to set before use. When you install the hammer and trigger pins,
they may be tight in the bushings and that's good. However, you have to
ensure that the pin will allow the hammer to freely rotate. You can do
this by putting the pin through the hammer before you install both in the
receiver and make sure the hammer rotates freely. If the hammer binds
on the pin, something has to give and as a fail safe, the right bushing
will unscrew from the receiver. Under normal use with a correctly sized
and lubricated hammer, it will work as intended and not be an issue.
The pins are captured in the receiver by the spring identically to a GI
lower set.
This product can expose you to chemicals including lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov. 
