BT APC Triggers

[azelyk]

Anyone here running an APC223 or APC300 with an after market AR-15 casette trigger? Was looking to drop in a Trigger Tech competition trigger in mine, wondering if they work or if anyone had experience with other triggers.

Thanks

 

[greentips]

No experience with trigger tech, but some of the systems may share the same "mil spec" AR hammer, but the striking point of the hammer on the firing pin could be slightly different. You should also be mindful APC has a firing pin spring, combined with a potentially different striking point on the hammer, using a hammer of different geometry may not be 100% reliable even though it generates the same amount of force when using in an AR15

The APC lower is also quite not exactly the same as an AR - your best bet is to start with a non-"cassette" trigger. Preferably one with a hammer face as tall as the original mil spec hammer. The APC hammer appears to be using the same casting as some of the Daniel Defence hammers.

 

[azelyk]

Thanks for the heads up Greentips. Found this article from TFB about AR triggers in APC guns.

https://www.thefirearmblog.com/blog/2017/08/16/success-ar-trigger-fitted-bt-apc/

The pin locations and layout is identical to an AR15 FCG, it’s the FCG pocket in the lower that isn’t compatible with all drop-in AR15 triggers. Essentially, B&T used their own AR15 trigger made in house for the APC’s, as you can take them out and install them in a standard AR in just the same way. Why start from scratch with a FCG when there’s a perfectly good FCG already available with tons of aftermarket support? Sort of like how the Mega Arms Maten is an AR10 but uses an AR15 FCG while the lower isn’t machined to standard pocket specs. They both accept AR15 triggers, they just won’t accept ALL of them. Has nothing to do with liability.

Seems like they take AR cassette triggers, just not all AR cassette triggers.

 

[greentips]

Another point is that the bolt velocity of the APC could be different from the AR15. Some of the aftermarket "match" trigger" is not designed for the higher bolt travel velocity in push rod system, causing hammer striking and breaking the disconnector.

A lot of the "match triggers" have lighter hammers in different geometry so to generate the same striking force on the firing pin, but this also means the hammer strikes faster and may hit the disconnector. Hence, a lot of "AR" style triggers have disconnector hoods to prevent strike for systems that are not using the original DI gas system, like HK.