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I love mine, I have gotten rid of all my verticals and switched over as well as most of the guys I shoot with.
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Update: I got my .300 Blackout barrel from Midway. It's an SI defense carbine length 1-8. Got it assembled on an A4 upper with open sights mounted so far. Fired about 40 rounds so far with about half of them not ejecting. They stove pipe in the action most of the time. Shoots fairly accurate for open sights but my purpose was to test the functioning. I fount out that Military 20 round clips work terrible but 30 rounders function perfect. Hmmmm I purchased a 20 round Magpul Pmag and it functions perfectly. My loads are 17gr of 296 with 150 gr Military pulled bullets. So the load is fairly hot. The port in the barrel of SI defense barrels are notoriously small from what I read on the net so I will open it up a bit and try again in a few days. By the way I fired a few 220 grain round nose bullets for the fun of it. (they don't feed well at all) but they shot incredibly accurate. Hmmmmm
Blitz with the Mag Pul AFG it's more of a place to rest the rifle on for longer ranges. Like resting it on your hand but it froce you to put your hand in the same location each time. It's like the E-2 Stocks you can buy.
The other (VFG) will be better for close in and things like room clearing. Some do hold a Bi-pod in side them to take up a little less space.
How far did you open it up. I haven't measured the hole yet but I figure it won't take much as it ejects about half of them now.
I've never used a set of Go, No Go gauges 'EVER' ... the 'SET' pictured in the image above were borrowed (loaned-out) from a friend, who offered me the set to use on my build, as he built a couple 300/BO units in the past year.Why are so many Blackout people concerned with go/no go guages? If you don't trust the barrel manufacturer to install the extension and check the headspace then you should be buying your barrel from someone else...
The only thing I disagree about with your statements is the conversion of .223 brass. From what I have been researching it seems a lot of labor would be involved in the sizing and trimming. The 300 shoulder starts below the current 223 shoulder etc. Not as easy to convert as say if you were doing 7mm TCU. However, new 300 brass is fairly inexpensive and that is what I will be doing myself. Unless you have a power trimmer and a lot of time - I would skip the .223 route.
I just bought a Harbor Freight cut-off saw and Hornady dies and while you are right it is kind of labor intensive to convert .223 brass it is kind of fun ... for now. I suppose the novelty will wear off eventually. I have to laugh at myself though. I have months and months of saving to do before I can actually buy a 300 upper but I just couldn't wait to get started so it's brass conversion that will have to scratch my 300 BLK itch.