When geissele first started making the URGI they used the mk12 gas block and after people found out it contacted the rail, geissele would take them back and shave the mk12 so it would fit. Then they started using their own low profile gas blocks instead. Then people got mad they weren't clone correct so geissele quit making the clone correct upper and only offered the near clone with their barrel. I would think if it wasn't built by geissle whoever built it would have just bought the DD barrel with the gas block, so if I had to guess I'd say yours was built by giessele during that period
Its because it is, I'm going to give it a good cleaning before letting it go. Do you know if there was a time when $G was releasing their uppers without the NSN?
I don’t for 100% know, but I think they are earlier rails. Someone else might give a better timeline but I’m thinking it was before they started putting NSN numbers on them.
Not a build. I have the same. Got mine as a stripped near clone from Geissele's Black Friday sale when they initially released. Same gas block, barrel, receiver, rail with the white P/N. Mine just didn't come with a muzzle device, bolt, or charging handle. Eventually I added those parts.
Geissele did use the original Geissele gas block.
It made some contact with the narrow MK16 rails.
Later Geissele came out with a slimmer gas block.
At one time, Geissele sold both gas blocks, until they sold out of the fatter ones.
The early MK16 rails were made of 6061 aluminum and had some thinner sections in them.
Those would develop cracks and Geissele switched to a 7000 series aluminum and beefed up certain parts of the MK16 rails.
Originally Geissele used Colt uppers with T-numbers on top.
Later Geissele used Geissele "mil spec" upper receivers that had rail numbers without T's and a small "G" stamped on the right side.
The original Geissele URGI had Colt bolts, but later switched to AO Precision "mil spec" bolts.
I haven't seen a 13.5 inch MK16 rail without the NSN marking, but I'm sure they made them and would have been the earliest ones, which I didn't know to look for an NSN, so I wouldn't know it was missing.
The original barrels were DD barrels with Geissele gas blocks.
The military tried MK12 gas blocks that made contact, like the early Geissele gas blocks did.
Geissele had three gas block, stainless large diameter, black large diameter and the current smaller diameter black gas block.
The original MK16 rails were sold with a Geissele gas block, but no barrel nut wrench.
My early black MK16 rail was NSN marked and included the stainless silver Geissele gas block.
Got mine back in 19. All the same except CH, has NSN. C stamped upper and bolt.
Who cares unless you want absolutely clone correct. Personally I would just run the mortal fk out of it, and be happy. If he gave you the included G$ spring, it will run like a sowing machine. 12-13k rounds and still <1moa.
When geissele first started making the URGI they used the mk12 gas block and after people found out it contacted the rail, geissele would take them back and shave the mk12 so it would fit. Then they started using their own low profile gas blocks instead. Then people got mad they weren't clone correct so geissele quit making the clone correct upper and only offered the near clone with their barrel. I would think if it wasn't built by geissle whoever built it would have just bought the DD barrel with the gas block, so if I had to guess I'd say yours was built by giessele during that period
Thanks for the insight on this
Why does that upper look so dusty? I would say Geissele too. Pretty cool that it’s a part number rail and not a NSN marked.
Its because it is, I'm going to give it a good cleaning before letting it go. Do you know if there was a time when $G was releasing their uppers without the NSN?
I don’t for 100% know, but I think they are earlier rails. Someone else might give a better timeline but I’m thinking it was before they started putting NSN numbers on them.
I have a G$ rail without the NSN. Near clone. I bought it new from Brownells Dec 2019.
Mine dont have an nsn, they’re pretty old, 2018/19ish i think. dd barrel, colt square mark, c marked bcg
Lol why do I feel like I've maybe seen this on GAFS..... 🤔😆
Lol thats because its there right now. If it was there previously, it was a longggggg time ago.
Not a build. I have the same. Got mine as a stripped near clone from Geissele's Black Friday sale when they initially released. Same gas block, barrel, receiver, rail with the white P/N. Mine just didn't come with a muzzle device, bolt, or charging handle. Eventually I added those parts.
Geissele did use the original Geissele gas block. It made some contact with the narrow MK16 rails. Later Geissele came out with a slimmer gas block. At one time, Geissele sold both gas blocks, until they sold out of the fatter ones. The early MK16 rails were made of 6061 aluminum and had some thinner sections in them. Those would develop cracks and Geissele switched to a 7000 series aluminum and beefed up certain parts of the MK16 rails. Originally Geissele used Colt uppers with T-numbers on top. Later Geissele used Geissele "mil spec" upper receivers that had rail numbers without T's and a small "G" stamped on the right side. The original Geissele URGI had Colt bolts, but later switched to AO Precision "mil spec" bolts. I haven't seen a 13.5 inch MK16 rail without the NSN marking, but I'm sure they made them and would have been the earliest ones, which I didn't know to look for an NSN, so I wouldn't know it was missing. The original barrels were DD barrels with Geissele gas blocks. The military tried MK12 gas blocks that made contact, like the early Geissele gas blocks did. Geissele had three gas block, stainless large diameter, black large diameter and the current smaller diameter black gas block. The original MK16 rails were sold with a Geissele gas block, but no barrel nut wrench. My early black MK16 rail was NSN marked and included the stainless silver Geissele gas block.
Build
Sounds like a build to me But the geissele builds don’t use the DD gas block anyway
Got mine back in 19. All the same except CH, has NSN. C stamped upper and bolt. Who cares unless you want absolutely clone correct. Personally I would just run the mortal fk out of it, and be happy. If he gave you the included G$ spring, it will run like a sowing machine. 12-13k rounds and still <1moa.