[PugetSoundSoldier]

The Kel Tec RFB is 7.62x51mm. It’ll get to 600m with enough energy to still get the job done!

[Blackhawk]

Sorry, that was part of a different conversation. Yes the Kel Tec has the power but with only the 18” barrel you won't get the accuracy. As an example I offer my 2 AR15’s. Both Colt HBAR, identical in every way except barrel length. One is 18.5 and the other is 24. At 50yds. no difference. At 100 yds. the 18.5 can put 30rnds in a 1.25”group. The 24” will do the same 30rds in a .75” group. At 500yds. (The longest measured range I have access to) the 18.5” will shoot a 9 inch group.(a 10x scope) With the 24” @500yds, same scope, 3” group. Point is you need the length to get the twists to make it accurate for the long shots.