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It's best to replace parts on your gbbr when they break. Performance will not increase significantly with aftermarket parts. Only durability.
When your lower receiver trigger group starts to fall apart, upgrade it with ratech trigger bits.
Ratech also make precision inner barrels and cnc'd steel bolts and steel bolt carriers.
You will also need to replace part 66 and part 27 on the we scar. The open bolt design will snap them. It's best to find a steel replacement for this as getting a replacement we part will just be delaying the inevitable.
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