Carbine buffer spring on Rifle length upper

[y2k]

When using a carbine/M4/CAR15 type lower mated to a 20in upper should a extra power Buffer Spring be used?

 

[hbean]

unless you experiences timing issues I wouldn't worry about.

 

[greentips]

No issue. Have been running 18" rifle using whatever carbine lower without any issue using a regular H buffer. C7 uses a H2 buffer. You don't need to change anything.

 

[y2k]

I have a Norinco M4 lower.

 

[RobertMcC]

C7A2 been used for many years. Its a carbine stock lower on a 20" upper. With a simple carbine buffer and carbine spring.

 

[TheM4chef]

Unless your running a A2 stock with the rifle buffer and spring (totally different than a carbine buffer/spring) your fine with what is installed in your lower currently since I imagine you have a collapsible carbine stock.

 

[y2k]

Unless your running a A2 stock with the rifle buffer and spring (totally different than a carbine buffer/spring) your fine with what is installed in your lower currently since I imagine you have a collapsible carbine stock.

Just a norinco M4 lower. Yes collapsible stock.