What bolt head size do I need

1lessdog Greenhorn Posts: 2	What bolt head size do I need Jun 17, 2017 19:23:44 GMT -8 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by 1lessdog on Jun 17, 2017 19:23:44 GMT -8 I have a BlackHole Weaponry barrel and is marked 264LBC 1-9. It is chambered in a 6.5. Grendel 20 inch. I have a 7.62x39 and some people say I can use the bolt off that upper. What do you think?

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What bolt head size do I need Jun 18, 2017 4:48:08 GMT -8

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Post by Deleted on Jun 18, 2017 4:48:08 GMT -8

Jun 17, 2017 19:23:44 GMT -8 1lessdog said:

I have a BlackHole Weaponry barrel and is marked 264LBC 1-9. It is chambered in a 6.5. Grendel 20 inch. I have a 7.62x39 and some people say I can use the bolt off that upper.

What do you think?

You can measure it. Drop an unfired case in the chamber. Take your 7.62x39 bolt and try to close it on the case. If it goes to full battery you have a type 1 chamber. This is most likely what it is anyway, but most were marked that way.

1lessdog Greenhorn Posts: 2	What bolt head size do I need Jun 18, 2017 7:24:44 GMT -8 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by 1lessdog on Jun 18, 2017 7:24:44 GMT -8 I dropped in a unfired case and closed the bolt. It closed fully and extracted and ejected nicely. So there shouldn't be a problem using the 7.62x39 bolt and carrier group.