Greetings from chesaning, mi,
I have a 450 that won't pickup a round after firing, it otherwise functions fine.
I assembled it myself from mil spec components from various manufacturers, except for some of the upper receiver. I had a custom barrel made by Jim from Apache Gunworks in LA, and had him assemble the muzzle brake, gas block and tube, and barrel to the upper.
The muzzle brake was a custom 2" with 15 degree to rear porting on a round brake that doesn't have sides or need to be indexed.
The barrel was a custom 21" stainless heavy barrel with 1:16 twist and a rifle length gas system. With an adjustable gas block and a free floating handguard. The lower has an M4/6 position butt stock
It shoots phenomenal with its 6.5-20 x 50 Leupold scope, last fall I went 3 for 3; a 6 pt at 235 yds on opening day, and does at 205 and 215 yds. (I use a leupold rangefinder to range and confirm) all one shot kills where they either didn't take a step or made it 5 and 15 yds.
At duncan's gun shops 200 yard indoor range I shot a three leaf clover with a 4th shot touching one of the "leaves", so a touch less than 1 MOA at 200 yds, which is less than 1/2 MOA at 100.
So needless to say the barrel/upper are incredibly accurate and shoot a little flatter than expected with factory Hornady ammo, and most handloads with 200-250 gr bullets, I just need to get it to cycle reliably.
I have tried numerous mags and modifications to them, different buffers and springs, i have tried various handloads from mild to max, and even different lowers. With a friends Wyndham lower it cycled sporadically, but not reliably.
I wanted to get a gurus 2 cents on how to proceed. I have read some that leads me to think the rifle length gas tube could be a likely culprit.
Troy Lapine
Blusqualo1@aol.com
M Go Blue