Colt 10.3 FSP Question

**Dutch110** · 05-22-23, 08:18

I am down the rabbit hole on my 10.5 SBR build when it comes to the barrel. I will spare everyone the details but one of the options I came across was a 10.3 Colt surplus barrel with the FSP. It is a cut down 14.5 model. Price is decent so I am seriously considering it (even if I do have to open up the port a bit to get it to cycle a wider range of ammo.) It is most definitely going to have a dedicated can. My one fear is with thread concentricity not knowing who did the chop. Anyone have any feedback/experience on this topic?

**Uncas47** · 05-22-23, 08:58

Originally Posted by Dutch110

I am down the rabbit hole on my 10.5 SBR build when it comes to the barrel. I will spare everyone the details but one of the options I came across was a 10.3 Colt surplus barrel with the FSP. It is a cut down 14.5 model. Price is decent so I am seriously considering it (even if I do have to open up the port a bit to get it to cycle a wider range of ammo.) It is most definitely going to have a dedicated can. My one fear is with thread concentricity not knowing who did the chop. Anyone have any feedback/experience on this topic?

If it's real surplus it was most likely cut down by Crane, it would probable be an early one with that FSB, although anythings possible in the supply chain.

**Dutch110** · 05-22-23, 09:10

Originally Posted by Uncas47

If it's real surplus it was most likely cut down by Crane, it would probable be an early one with that FSB, although anythings possible in the supply chain.

They have manufacture dates from 2001 - 2010. Not sure which year (if any?) are better / worse? If Crane did the cut I am going to assume it's ok and take a flyer. I have an email into the vendor asking as well as if the FSP is F marked or not. I would really like to do a CL barrel for this build.

**Stickman** · 05-22-23, 10:37

Originally Posted by Dutch110

They have manufacture dates from 2001 - 2010. Not sure which year (if any?) are better / worse? If Crane did the cut I am going to assume it's ok and take a flyer. I have an email into the vendor asking as well as if the FSP is F marked or not. I would really like to do a CL barrel for this build.

Where are you seeing a vendor selling 10.3" legit surplus barrels? If you really felt like you wanted 10.3 over better offerings (making clones or whatever is still great don't get me wrong), I would be suspect over the barrels actually being valid mil surplus.

**Dutch110** · 05-22-23, 10:59

Originally Posted by Stickman

Where are you seeing a vendor selling 10.3" legit surplus barrels? If you really felt like you wanted 10.3 over better offerings (making clones or whatever is still great don't get me wrong), I would be suspect over the barrels actually being valid mil surplus.

I already have the better barrel lengths. This is because I want to see just how much gas I can take to the face while shooting suppressed. Figure I'll put on a YHM Turbo K and try out my WW2 surplus gas mask and see if the charcoal canisters still work

In all seriousness it's just another project I want to take on and play around with. I'll DM you the vendor. Don't want to get in trouble posting sales links in here to non site sponsors

**Pappabear** · 05-22-23, 12:19

Any reason to not just buy a Factory new LMT or Colt 10.3 or 10.5? I have gone that route with good success.

PB

**Dutch110** · 05-22-23, 17:08

Originally Posted by Pappabear

How much is the unknown barrel? It might be cool if it all works out, but if it doesn't you have waisted every dime, not just the $100 plus you mention. Best of luck either way Dutch.

PB

Thanks PB. It ended up being 200 shipped so I took a flyer. Seller has A,B and C grade with him saying A and B are "excellent condition" and C being "Historical grade but functional." I opted for A. I'll either be a hero or a goat. I'll report back once I have it in hand.

**Pappabear** · 05-22-23, 18:02

Originally Posted by Dutch110

Thanks PB. It ended up being 200 shipped so I took a flyer. Seller has A,B and C grade with him saying A and B are "excellent condition" and C being "Historical grade but functional." I opted for A. I'll either be a hero or a goat. I'll report back once I have it in hand.

If you need to chock it down you could use BRT tubes and maybe not do any damage, if your familiar with those tubes. Hopefully it runs as is.

PB

**utahjeepr** · 05-22-23, 17:08

I could be wrong, but I thought all the "legit" surplus cut downs dried up years ago.

If it's right it doesn't matter who cut it. If it's wrong well...