450 Bushmaster HALP!!!

Discussion in 'Big Bore Rifles' started by Infamous1, Mar 10, 2019.

  1. Infamous1

    Infamous1 Well-Known Member Supporting Member

    Joined:
    Dec 28, 2017
    Messages:
    1,981
    Likes Received:
    3,411
    Location:
    Pittsboro
    20190310_202441.jpg 20190310_202417.jpg 20190310_202407.jpg 1552264518267167599759.jpg 1552264617815-1551319553.jpg images (1).jpeg
    Got a 10.5" 450 Bushmaster upper from Bear Creek (I know I know) with dreams of shooting piggy pigs. I have two lancer 20rd battle mags and tromix followers, 2 20rd SS mags, one SS 30rd mag and one lancer 10rd battle mag (notched the front of this mag) put chambers tactical single stack followers in the latter four mags. Shooting Hornady 250gr FTX factory loads. Same issue with all the mags. Bolt won't seat 50% of the time on follow up rounds. Cases look pretty boogered up, gaulded on some of them, had to snatch on it pretty hard to get a fresh round out of the chamber that wouldnt fire. Trigger snapped but it did not fully strike the primer, it is the last casing pic. Here are a few pics.
    First pic is of two rounds put into a mag and cycled by hand. The rest are empty casings cycled by the gun.
     
  2. backwoodsshooter

    backwoodsshooter Well-Known Member

    Joined:
    Dec 17, 2016
    Messages:
    3,165
    Likes Received:
    3,845
    Location:
    In a $l-l!t hole on top of a hill
    I always used metal GI mags with the followers in them. try one and see what happens.

    But buffer and spring, what are you using?
     
    Infamous1 and Short Fuse like this.
  3. Short Fuse

    Short Fuse Well-Known Member Supporting Member

    Joined:
    Dec 17, 2016
    Messages:
    1,492
    Likes Received:
    1,130
    Location:
    Fuquay Varina
    Rounds not seating compltely or sticking in a new chamber suggests you might need to polish the chamber. I too am interested in your buffer system and gas block alignment. It looks like you have a couple of issues here. Polish the chamber really well and check you gas block alignment. Try a different mag as suggested earlier and let us know what happens.
     
    Last edited: Mar 11, 2019
    BatteryOaksBilly and Infamous1 like this.
  4. Infamous1

    Infamous1 Well-Known Member Supporting Member

    Joined:
    Dec 28, 2017
    Messages:
    1,981
    Likes Received:
    3,411
    Location:
    Pittsboro
    No idea on buffer and spring, I just put it on a pistol lower I picked up off of here. I will polish the chamber and see what buffer and spring I have. Heavier is better for this application I am assuming?
     
  5. Infamous1

    Infamous1 Well-Known Member Supporting Member

    Joined:
    Dec 28, 2017
    Messages:
    1,981
    Likes Received:
    3,411
    Location:
    Pittsboro
    Also forgot to add, I am running this with a LAW folder so it has the bolt extention on the rear of the bolt.
     
  6. Infamous1

    Infamous1 Well-Known Member Supporting Member

    Joined:
    Dec 28, 2017
    Messages:
    1,981
    Likes Received:
    3,411
    Location:
    Pittsboro
    BCA sent me a return label and said they would fix it or replace it with one that would run. They said they have approx a 4 week turn around on issues like this but it would be resolved. It is on it's way back.
     
  7. Infamous1

    Infamous1 Well-Known Member Supporting Member

    Joined:
    Dec 28, 2017
    Messages:
    1,981
    Likes Received:
    3,411
    Location:
    Pittsboro
    If I decide to build a dedicated lower for this upper what are some suggestions on buffer weight and spring combinations? Would LAW folder have any negligable effect on it? Not dead set on the LAW on a dedicated lower but I do like the idea of a backpackable big bore.
     
  8. Michael458

    Michael458 Active Member

    Joined:
    Mar 20, 2019
    Messages:
    794
    Likes Received:
    2,295
    Location:
    Conway

    Sounds like a good plan. I looked over this, and its way out of my area of expertise, and above my pay grade, so nothing to offer. I think what you are doing, is exactly what I would do. I am not very mechanical, and they don't allow me any serious tools anymore. You should see the things I can tear up with the right tools! I am handy with a bastard file too, until I file things down to shavings...... I do get carried away.
     
  9. Average Joe

    Average Joe Just A Everyday Joe Life Member Supporting Member

    Joined:
    Dec 18, 2016
    Messages:
    1,429
    Likes Received:
    2,345
    Location:
    Here
    @Infamous1 do big bore ARs have free floating firing pins like the 5.56 models? The picture of the dimple in the primer actually looks normal for a bullet that has been properly chambered by a rifle with a free floating firing pin.
     
    Infamous1 likes this.
  10. Infamous1

    Infamous1 Well-Known Member Supporting Member

    Joined:
    Dec 28, 2017
    Messages:
    1,981
    Likes Received:
    3,411
    Location:
    Pittsboro
    It was a really light strike compared to the other rounds that actually went off. I was able to see the bolt move forward slightly when I began the manual extraction process on the live round.
     
    Average Joe likes this.
  11. BatteryOaksBilly

    BatteryOaksBilly A SHOOTER Benefactor Life Member Supporting Member

    Joined:
    Jan 1, 2018
    Messages:
    11,933
    Likes Received:
    30,735
    Location:
    Conway, S.C.
    See??? it runs in the family!!!!
     
    Infamous1 and Geezer like this.
  12. Pink_Vapor

    Pink_Vapor “Not as funny as he thinks he is”, spouse Supporting Member

    Joined:
    Jul 1, 2017
    Messages:
    6,744
    Likes Received:
    8,815
    Location:
    Moncure, NC
    4 week return?
    Bear Creek is located 20-30 mi south of you.
    If you’ve the time, take a drive S.
     
    BatteryOaksBilly and Infamous1 like this.
  13. Average Joe

    Average Joe Just A Everyday Joe Life Member Supporting Member

    Joined:
    Dec 18, 2016
    Messages:
    1,429
    Likes Received:
    2,345
    Location:
    Here
    Make sure to ask what was wrong and keep us updated. Looking at the cases it appears to have some real issues!
     
    Infamous1 likes this.
  14. Infamous1

    Infamous1 Well-Known Member Supporting Member

    Joined:
    Dec 28, 2017
    Messages:
    1,981
    Likes Received:
    3,411
    Location:
    Pittsboro
    Oh yeah I know exactly where it is located, I just have alot of stuff going on right now and it was not worth my time to see it through in person. Its already been mailed and the reason I built it initially is already ground into sausage and in the freezer. I will update as I receive info. I do feel that the setup I had on the .450 with the Leupold 1.5x4 scope, offset flip up sights and a single point sling would have been absolute perfection for everything I encountered down there in FL though .
     
  15. Infamous1

    Infamous1 Well-Known Member Supporting Member

    Joined:
    Dec 28, 2017
    Messages:
    1,981
    Likes Received:
    3,411
    Location:
    Pittsboro
    Well recieved a brand spanking new upper assembly from BCA today. Just said we have decided to replace it. The new one looks overall really good. The picatinny rails actually fit my Nikon mount this time with no issues, the charging handle actually locks closed without any issues, the barrel lugs do not have any sharp edges and the chamber looks smooth. I am initially impressed. Got the scope mounted and bore sighted and got the back-up sights mounted. I am going to try to get it to the range and see how it runs in the near future.
     
    Combat Diver and Slacker like this.
  16. Combat Diver

    Combat Diver Well-Known Member

    Joined:
    Jun 10, 2017
    Messages:
    3,050
    Likes Received:
    9,288
    Location:
    Supply NC
    First upper must have been assembled during the raid and they forgot what they were doing.

    CD
     
    dman24 and Infamous1 like this.