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[davidjinks]

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[Eric D.]

I noticed the same thing when I first took my BCM to the range. Other members assured me its not an issue and any leakages will self-seal over time.

.223 seems sluggish? What buffer are you running? I'd advise having the gas block pinned. Otherwise, if its not giving you reliability issues, forget about it and shoot.

[ssracer]

Who installed the block? Sounds like possibly the gas port on the barrel and the port on the block aren't lined up just right. The block has a larger hole than the barrel to allow for some leeway, but it could still be off.

Define "sluggish" with .223

.223 is going to tend to be less powerful and therefore need more gas through the tube to operate properly. If the alignment is off is may not be getting enough for .223 or just barely enough.

I had my alignment off at first and while my rifle would cycle wolf .223 fine it wouldn't always lock open on the last round. Fixed my alignment and it works perfectly.


Could also be break in as said above. Put some more ammo through it and see what happens

[davidjinks]

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[Iraqgunz]

Did you contact ADCO? Pretty sure that they pin them in place.

Sluggish meaning that there is a discernible difference in the recoil. The recoil seems weaker (Possibly die to using .223 ammo) and the movement of BCG and ejection of the brass. Kind of hard to explain because it's the "feel" of the rifle operating.

The buffer is a standard rifle buffer. It's set up with an A2 stock.

I tried to find a company I can send the barrel to to have it pinned. No one seems to want to do it.

ssracer:

The block was installed by the builder.

I'm wondering if a knock to the block could have shifted it a bit.

I've got around 500 rounds through it so far. I will hit the range some more and give it a good workout.

[ssracer]

.223 is generally underpowered compared to 5.56. I can tell the difference between the two in my carbine. If it's running right I don't think I'd worry too much about it unless it starts causing actual issues.

[davidjinks]

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[Belmont31R]

Not all ammo is of the same quality. If you are having reliability with good .223 ammo then its something to worry about.


Its completely normal for .223 to feel much less powerful.


Its also normal to have some gas leakage. My Mk12 build had about 3" of carbon residue behind the gas block. It never had any reliability issues at all from Hornady steel case up to full power 5.56 loads. If your barrel is running the proper size gas port it was designed to be used with 5.56 pressure ammo anyways. You still should be able to shoot good 223 ammunition but may have some issues with the bottom of the barrel stuff.

[davidjinks]

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[Belmont31R]

Definitely know about ammo quality.

The only ammunition I have used in this rifle has been:

Blackhills MK262 MOD1
Blackhills 77 Gr. OTM .223
Blackhills 75 Gr. OTM .223
Blackhills 69 Gr. OTM .223

The 77 Gr. OTM .223 gives me the same "feel" as the 262. The others definitely "feel" different.

No other reliability problems to report of.

I do know that the barrel is the Douglas barrel that is used by Crane.


Have you had any reliability issues aside from a difference in feel between the loads? The gas port and chamber is designed to shoot mk262.

[davidjinks]

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