porting barrel vs muzzle break

22lr

22lr

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If I am going to chop ny next M14 - can I just drill out some rifled portion at the end and port it instead of threading and buying muzzle break? Has anybody done it? How would you port? Like how many holes where and how big? And how big drilled-out portion diameter should be? If it worth doing at all I mean.

Ok, and how to make nicely cut crown inside drilled portion? Or maybe I should just leave rifles intact and port sides of a barrel? I know some people have done it but I am not sure if it is good at all. Thanx in advance as usual.
 
22lr said:
If I am going to chop ny next M14 - can I just drill out some rifled portion at the end and port it instead of threading and buying muzzle break? Has anybody done it? How would you port? Like how many holes where and how big? And how big drilled-out portion diameter should be? If it worth doing at all I mean.

Ok, and how to make nicely cut crown inside drilled portion? Or maybe I should just leave rifles intact and port sides of a barrel? I know some people have done it but I am not sure if it is good at all. Thanx in advance as usual.
Click to expand...

How would you de-burr the holes after drilling?
 
Wont work

22lr said:
If I am going to chop ny next M14 - can I just drill out some rifled portion at the end and port it instead of threading and buying muzzle break? Has anybody done it? How would you port? Like how many holes where and how big? And how big drilled-out portion diameter should be? If it worth doing at all I mean.

Ok, and how to make nicely cut crown inside drilled portion? Or maybe I should just leave rifles intact and port sides of a barrel? I know some people have done it but I am not sure if it is good at all. Thanx in advance as usual.
Click to expand...

The chrome bore prevents porting. The chrome would start flaking off around the ports - ruined barrel - Even chopping the barrel requires expert gunsmithing.
 
If you want a detailed procedure that might have a chance of working that doesn't involve bubba and a Black and Decker - or Dremel - bubba loves Dremels - you could try this:
Remove the barrel, cut it to length. Square up the cut end on a lathe. Set it up in a mill using an indexing rig. Adjust either the work or the head of the mill to give a slight foreward angle to the holes. Drill your hole pattern using the mill's "Y" feed and the indexing head to get precise hole spacing both lengthwise and rotationally. Use a very short, stiff drill, or even an end mill, to reduce the tendency to run out. Once all your holes are in, use a piloted carbide counterbore to clean out the bore in the brake area. The counterbore should be .030" to .040" larger than bullet diameter. The counterbore should create an acceptable crown at the end of the rifling.
Alternatively, you could scribe layout lines, measure and centre punch hole locations, set the barrel up in a drill press, and have at. Use a centre drill, you might have a better chance of avoiding runout. Drilling into a curved surface can get exciting. Then put a 11/32" drill in your Black and Decker, and run it in until you are past the last hole. It might follow the bore closely enough to leave an acceptable crown.
 
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