Maybe you do, maybe you don't. Depends on the intended use of the firearm in question. A battle trigger is simple and basic. It works every time because it has to because lives are on the line. A competition trigger has more adjustments for fine tuning but these adjustments also tend to lower reliability. So when you build a firearm it's always important to keep the intended use in mind when deciding on parts. You don't want a competition trigger in something you anticipate reaching for if someone's life is on the line.
Perfect example: over Christmas I took my LR308 back to Nebraska along with a few other guns to shoot. I took it out of my rifle bag and connected upper to lower and when I went to shoot it... nothing. Took it apart and realized the front set screw on the JP had worked it's way down a couple mm but where I keep it set to break instantly it doesn't take much. A little Loc-tight will fix that for good but the point is had that been a defense situation it would have been the WRONG time to find out.
In my 'go-to' AR15 I have the mil-spec LMT trigger that came with kit and JP springs for a lighter pull. Nothing else. Not as crisp or travel free as the LR308 but I know it will work w/o fail every time I pull it.
So when building a firearm know the difference between battle parts and non-battle parts as well as your intended use.




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