
Originally Posted by
Malletor
Yeah right now either upper would go on a stock colt 6920 lower, but my next project is to build it's own lower with a SSA-E. I really appreciate all the input from everyone.
Does anyone have any experience with BCM's ionbond coating they put on the SS410 barrels? I honestly like the bare stainless look better but if the coating has some significant advantages I might go with it instead of the plain stainless finish.
Run the bare stainless if you like it, it's just fine. Ionbond is nice for a harder use barrel, I guess, but in that application it doesn't do much more than a parkerize treatment, and neither does much more than bare SS if you clean it each trip, as I suspect a precision upper my warrant for you.
The SSA-E (or, if you intend to stick with just one lower, you'd be truly amazed at how good the SSA is for light precision work, yet still 100% capable as a defensive carbine - if you want to run one lower and two uppers, I'd go SSA - two lowers, still an argument to be made for SSA) is an amazing trigger - just be aware that getting one Geissele trigger will incur the desire for another if you have a second lower. I liked my first so much, I'm now down to just two triggers that aren't a GSSA or GSSA-E - and they're KAC NM units.
A far as length - you have to be out where velocity matters, or shooting quick enough split times where tenths matter to see where the rifle gassed 18" units can outperform the 16". With heavier rounds, that velocity difference isn't as key until you're focusing on shooting MOA past 500yd where that bit of velocity can help deal with wind, but it has a lot more to do with minimizing how much adjustment is required from the shooter.
If budget is a major requirement, I'd look seriously at upgrading the Colt lower (SSA, better stock such as a SOPMOD type) since that's an upgrade which improves the performance of both uppers you'd own, and can certainly be kept on the 6920 as funds allow for completing the next rifle.
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