BCG relacement ?

[chadbag]

If you go with a protected firing pin bolt carrier (m16) I think you need to upgrade your hammer as well. The old standard unprotected bolt carrier was teamed up with a hammer having a notch cut-out. Does anyone have problems running a notch cut hammer and protected firing pin bolt carrier?

I am not an expert but I don't think this is true. (And you probably would run afoul of the ATF no full auto parts bit)

DD sells their upper with a semi BCG with shrouded FP. LMT's semi BCG also has the shroud if I remember right

[graysoncountytexas]

Iraqgunz,

Just to clarify - you are saying I need to confirm headspace when replacing BCG?

[markm]

Does anyone have problems running a notch cut hammer and protected firing pin bolt carrier?

No. Didn't we cover this yesterday?

[toddackerman]

Just a little piece of advice. If you are referring to bolt carrier groups- i.e. the bolt and carrier complete don't forget a good headspace gauge. Especially if you are mixing manufacturers.

This is good advice when you start to swap new bolts into old barrels. Ideally, you would want to get a 5.56mm "Field Gauge" from Brownells. Proper use will tell you if the headspace between the new bolt and chamber are within spec., and it's easy and the gauges are around $25.00

There was a lot of talk about this on this forum in the past and if you do a search on Headspace, you will find a lot of good info.

[bufit323]

I ordered something from Bravo Company a while back and had a small issue with the order. I had to send something back, at first I was not happy paying the extra $5 return shipping, then when my package came back around to me Paul had tossed an extra USGI 30 rd mag into the box. More than made up for my out of pocket expense.

Pleased to do business with them, I have been looking out for a BCM thread to toss that into.

Also, before I made my order, we went back and forth on email with my asking questions about products. I got swift answers every time. Really a good place to send your dollars.

[TheActivePatriot]

You should not have any headspace issues with putting a new bolt in a used barrel. Since the locking lugs wear both ways, headspace should be slightly tighter with a new bolt. Problems arise when you couple a used bolt with a different used barrel, because wear patterns won't be identical.

[Iraqgunz]

Sorry, I have to disagree. If you are swapping bolts between uppers whether they are new or used you should be checking the headspace. Of course, I repair and inspect weapons to the TM or OEM standard so maybe it's just me.

We are talking about a gauge that is not Unobtanium and fairly cheap. To me it just makes good sense.

You should not have any headspace issues with putting a new bolt in a used barrel. Since the locking lugs wear both ways, headspace should be slightly tighter with a new bolt. Problems arise when you couple a used bolt with a different used barrel, because wear patterns won't be identical.

[Broadway]

Checking the headspace is just cheap insurance. It should not be an issue with a new bolt, but it takes a minute so there is no harm.