Pairing down, if you can only keep 3 ARs.

[Erni]

@MarkCO, curious why 20" vs longer on the heavy?

Yarg!

[MarkCO]

@MarkCO, curious why 20" vs longer on the heavy?

Yarg!

The longer the barrel, the thicker it needs to be to maintain accuracy. On a gas gun, ALL of the barrel mass is hung on aluminum threads with varying degrees of tolerance. Even with a shimmed, or thermal fit barrel torqued above 75 ft-lbs, you will get some thermal drift. The 20" barrels minimize that effect due to less leverage on the threads. The increased accuracy is more important to me than 100 fps of velocity.

I built identical Kreigers, and the 20" had less drift of the POI as compared to the 24". Both shot very small groups, the 24" just walked them around a little bit more based on ambient temperature and the barrel temperature.

Not saying a 24 is bad at all and depending on what you shoot and how, the 24 might offer some benefits over the 20. For me, the 24 does not provide me any benefit over the 20.