Phase two; Yesterday I ordered a bolt carrier group that requires full assembly ($20.00 cheaper than the pre-assembled one); and an upper parts kit which includes the dust cover and parts and the charging handle.
Barrel, handguard, gas tube, gas block will be phase three.
I am debating if I should go with a 20" barrel chambered in .223 with a 1 in 12 twist for $100.00, or go carbine length with a 1 in 9 twist in 5.56 for $230.00 There are pistol length barrels available (all kinds), but I have heard that they can be hard to tune for reliability with the short gas tube, and short pressure duration, they are super loud (close to your head), and for me just seem pointless.
Regardless of what barrel length, these are restricted here in Canada, so can be used only on a range, not for hunting, so heavier projectiles are not high on my list; I will be shooting mainly .55 grain ammo.
Since cartridge specs are identical for .223 and 5.56, I can't see why the difference in chambers (.223, .223 Wylde of 5.56) make any difference other than from a marketing stand-point. I have been using both in my remington 78 for years, and have no issues with either, other than it does shoot lighter bullets better due to it's slow twist, I think. I home load for varmints, but use the cheapest .223 for plinking at the range.
I likely will not be doing 3 gun, so what are your thoughts; pros and cons for each?