BCL102 issues

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jza

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BCL 102 from the second pre-sale. I am having issues with the bolt not locking back on the last round.

The minimum load of CFE 223 behind a 147 grain Campro is 48.4 grains. If I load this amount, the round is accurate but the bolt fails to lock back on the last round, regardless of what magazine I use.

If I load 49 grains of CFE 223 behind a 147 grain Campro, the groups are still god, but the bolt still does not lock back on the last round.

If I load 48 grains of CFE 223 behind a 147 grain Campro, the groups open up but the bolt finally does lock back on the last round.

The ejection is 2-3 o'clock.

Is my rifle over gassed?
 
Get an adjustable gas block. But if the bolt doesnt lock back its under gassed.

Is you bolt head drop free and sloppy ? How are the gas rings ?
 
DILLIGAF said:
Get an adjustable gas block. But if the bolt doesnt lock back its under gassed.

Is you bolt head drop free and sloppy ? How are the gas rings ?
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I was thinking under gassed too, but it cycles fine, always picks up another round. The reason I am thinking it is over gassed is the more powder I use, the worse the problem gets. Almost as if the bolt is moving too quickly, but I am no expert. The gas rings have never been able to support the weight of the bolt. The gas rings were fine about 100 rounds ago. Gun only has 100-200 rounds through it. Taking the bolt apart is a pain in the ass because the retaining pin is for an AR15 and is too small. BCL quality.
 
jza said:
I was thinking under gassed too, but it cycles fine, always picks up another round. The reason I am thinking it is over gassed is the more powder I use, the worse the problem gets. Almost as if the bolt is moving too quickly, but I am no expert. The gas rings have never been able to support the weight of the bolt. The gas rings were fine about 100 rounds ago. Gun only has 100-200 rounds through it. Taking the bolt apart is a pain in the ass because the retaining pin is for an AR15 and is too small. BCL quality.
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That might be the problem.

Have you tried any other ammunition?
 
Weird. Maybee someone with more expérience will chime in. Ive also seen pictures on here of how little the bolt catch actually engages the bolt.
 
tiriaq said:
That might be the problem.

Have you tried any other ammunition?
Click to expand...

I read that the gas rings for a .308 bolt are not supposed to support the weight of the bolt. Again, I could be wrong. The Internet is full of misinformation.

I've only tried the Aguila (works great) and hand loads.

DILLIGAF said:
Weird. Maybee someone with more expérience will chime in. Ive also seen pictures on here of how little the bolt catch actually engages the bolt.
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Maybe 1/8th of an inch...
 
Do you have obvious wear occurring here?

39585786205_e65d7b7b45_h.jpg
 
jza said:
Yes... and lots of debris piled into the little cut out. And wear around the ejection port.
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I can send you my POF roller cam pin if you want to try it out. Might help if the factory cam pin is dragging. Its not like I need it anytime soon... lol...
 
My two cents (but probably on worth half as much) is ....

- probably over gassed
- an adjustable gas block worked wonders
- POF Cam Pin may be a good investment for the OEM BCG
 
DILLIGAF said:
I can send you my POF roller cam pin if you want to try it out. Might help if the factory cam pin is dragging. Its not like I need it anytime soon... lol...
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Lol... I am wishing I bought receivers now. The factory guns are nice but they're far from perfect. The more you look, the more small annoyances you find. Do you think the cam pin would cause the issue of not locking up? I need to do a Brownells order, just not sure what parts I'll need just yet. Probably all of them.

CODFan said:
My two cents (but probably on worth half as much) is ....

- probably over gassed
- an adjustable gas block worked wonders
- POF Cam Pin may be a good investment for the OEM BCG
Click to expand...

Thanks.
 
jza said:
Lol... I am wishing I bought receivers now.
Click to expand...

Im sure ill have problems as well :) . But if you want to try out some parts before you buy them drop me a PM and ill send them to you to test out.

Or send me your 102 :) and ill fix it :)

Guns are like Jeeps, Fun to play with but even more fun to get running... ;_)
 
If the bolt locks back at the lowest load, perhaps you are over gassed instead, while I am no expert on reloading, but 48-49 grs of CFE223 powder for 147 grain bullet seems kind of high,
 
jza said:
.... I need to do a Brownells order, just not sure what parts I'll need just yet. Probably all of them.
Click to expand...

You are going down the rabbit hole now :)

Starts with changing the gas block and maybe the cam pin

Next day you decide to order a new BCG and a buffer while you are at it.

Next week the replacement barrel is on order.

It is part of the fun of with BCL102. :)

In all seriousness.... the adjustable gas block worked great. A good investment for sure.
 
hbean said:
If the bolt locks back at the lowest load, perhaps you are over gassed instead, while I am no expert on reloading, but 48-49 grs of CFE223 powder for 147 grain bullet seems kind of high,
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I am no expert either... but that is the posted data lol. I didn't just make it up... I'm dumb, but not that dumb.

Plus, here's the kicker, my buddy has the same gun. We picked them up on the same day. His won't even cycle 48 grains of CFE 223, under the same 147 grain bullet. The serial numbers are only a few numbers apart.
 
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I’m confused and bemused at the same time.

At the risk of trolling / going on a bit of a rant, ARs have been working for half a century with a fixed gas block.

Now these parts seem to be the flavour of the moment with everyone and their dog using them in conjunction with tuning their buffers, buffer springs and screwing around with light weight and ultra light weight carriers.
They then wonder why their gun doesn’t work and start throwing out diagnoses of being ‘over and under gassed’:HR:

I’m curious, how do you some of you guys come upon your experience and to the conclusion it is providing too much gas to the carrier? Are you measuring the volume some how or conducting any other tests that evaluate how much is too much, too little and just right?
Is it the subjective feel of recoil, that compresses your shoulder just so that you know it’s a titch too hard and therefore must be ‘over gassed’?
 
Ar's work without adjustable gas blocks, Honda civics also get you form A to B

Youtube adjustable gas block and you'll see why we change them. I rather have a smooth running Ar. Once you fire an Ar with a JP Spring/ Adjustable gas block youll understand :)

Is like driving a high end car. Once you drive one jumping into your civic is pretty lame after. Same as shooting a Cadex and grabbing a Savage after... lol...
 
I don't disagree. I can only comment by my personal experience which was:

- Original configuration of the BCL102 (initial release - "Gen 1") - brass (using XM80 and IVI 7.62 with '72 head stamp) was ejecting forward to around 2 o'clock
- Multiple Failures to Feed a round

- Changed 1 part - adjustable SLR gas block - two shots to adjust - et voilà - feeding issues gone - brass now at 4 o'clock

Conclusion? Maybe just my rifle - not sure?
 
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