Hoot wrote:Did Trident ship it with a magazine and did that one work OK? In your picture thread, you show what appears to be composite mags. How did they do? Approximately how many round do you have through the rig? IE is it broken in? If not, running it wet can help until the surfaces are work polished. Do the ASC mags come with a single stack follower or a conventional 5.56 follower? That last question is more to the jamming issue than no BHO.
Divide and conquer. If you're somewhere where its not a big deal to let a shot go or like me 10 minutes from the local range, here's something to try WRT no BHO on the last shot. Chamber a round and remove the magazine. Assuming you shoot right handed, take your left thumb and apply pressure on the BHO latch where it sticks out of the lower. Maintaining firm pressure on the latch, let one go. Don't worry, I've done this to TS people's rigs. You're trying to create the BHO action normally provided by the presence of a magazine, but without it. What you're trying to accomplish is differentiating inadequate gas versus magazine drag on the BC not allowing it to go back far enough to catch the latch. Feel the latch out with a magazine in and out. You'll get a sense for what the thumb has to do. Repeat a few shots to disqualify a random event.
If it stay open, you know beyond a shadow of a doubt that the mags are the problem. If it won't latch, you have to consider the issue being as I mentioned, lack of ease of cycling but more likely, you're right on the edge of adequate gas flow. I'm assuming you already checked the gas block registration, looking for the soot ring to indicate that it is located so that it doesn't obstruct a portion of the gas port in the barrel. Suddenly, I'm getting a deja vu feeling, like I recently discussed this.
Get the issue of gas supply out of the way before proceeding to magazine tuning and report back.
I sometimes overlook the obvious questions like, Does the BHO work when the action and BC have been recently cleaned, only to get spotty once it gets dirty?
Hoot wrote:* I will be trying out the Non Mag thumb technique in early January and report back. I have loaded a single round - and then placed the mag in after, altering to the other mag to see if it worked - and either without Mag or With Mag it still does not hold the carrier open.
plant_one wrote:Hoot wrote:* I will be trying out the Non Mag thumb technique in early January and report back. I have loaded a single round - and then placed the mag in after, altering to the other mag to see if it worked - and either without Mag or With Mag it still does not hold the carrier open.
with no magazine inserted and without doing like hoot suggested, you will never get a bolt hold open on the last shot.
the follower in the magazine is what pushes the bolt catch upwards to engage the bolt on an empty magazine.
one thing to test real quick, with an empty magazine inserted (preferably one of the ones you're having trouble with) and from a closed chamber, can you pull the charging handle back and have the bolt lock open that way?
i only ask because i have seen reports, not 450 bushmaster specific but applicable since its a standard lower, of folks having issues with BHO (bolt hold open) due to out of spec bolt catch - specifically how it engages the follower, or lack of engagement as the case may be. the stem that engages the portion of the magazine follower was milled too far back if i recall correctly, and wasnt causing the bolt catch to pop upwards like it should.
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