Bolt Markings

AR/M4 AR General Discussion
1

Hi,

I ordered a complete bolt carrier group that I was told was a Daniel Defense. It’s an AR15 not M16 bolt with no markings. Bolt is marked E or possibly F underlined. Finish is phosphate, keys are very well staked.

Should it be marked DD in any way?

Thanks

2

I’ve googled that a little and it would seem that F underlined bolts are maybe FN produced, probably not, but there seems to be very little actual info.

3

where did you order it from?

mine is full auto and is marked like this with no markings on the bolt itself:

4

It actually came OEM with a rifle from a nice brand. My guess is they they just were getting unmarked OEM DD BCGs but I was curious.

5

The barrel is definitely DD.

6

That’s the problem with various production runs of DD or BCM… Some had no markings.

I’d shoot it and not worry about it.

7

That was the plan.

8

Not really worried, just, I’m one of these people who is curious about things and likes to find out details of the way things are.

9

That’s how mine looks. I don’t think DD makes them in-house anyway, so I wouldn’t worry about it. Probably the same BCG, but the newer ones are just laser engraved.

10

Really? I thought they did make theirs in house.

11

I’ve heard BCM doesn’t DD does.

12

I am pretty sure DD makes theirs in house.

13

Haha cool guess we’re on the same page.

14

Well, you learn something new every day!

15

Let’s leave the speculation. I believe that real FN bolts are marked MP F. Not sure about the underlined F. I seem to recall some time ago that PSA was selling some bolts like that.

16

In the photo in post #4, does your bolt carrier look like the middle one(semi-auto) or the bottom one(full auto)?

https://www.m4carbine.net/showthread.php?t=14534

If it’s the semi-auto, you did say it was an AR-15 BCG, I would be curious to know if DD ever sold phosphated semi-auto BCGs. I know they sold some chrome BCGs that had semi-auto carriers.

17

It’s definitely a semi-auto.

18

I can’t promise you, but I think that is an FN bolt, and IIRC, FN machines bbls and bolts for a number of other companies. Again, no promises, but I’m fairly surethis is the case.