Is a 20" rifle as hard on a bolt as a carbine?

[ABNAK]

??????????

Could you (in theory of course) use an 8620 bolt on a rifle where it wouldn't be advisable on a carbine or shorter gas system? i.e. are the stresses on a bolt less with a rifle?

[justin_247]

I wouldn't use anything less than 9310 in any length of gas system.

Look, here's one with a 9310 bolt for $120:
http://www.aimsurplus.com/product.aspx?item=XDSABCG&name=DSA+AR15%2fM16+.223%2f5.56x45+Bolt+Carrier+Group&groupid=587

[jumbopanda]

Eh, I don't think there's any reason to use substandard parts for any application when proper ones aren't that much more expensive.