I guess even Colt screws up.

Sttrongbow · February 9, 2009, 10:04pm

So, my brand new Colt 6920 arrives, and she is pretty. Only one problem… the friggin’ FSB is CANTED. I kid you not. Canted. It need full right adjustment on the BUIS to get it aligned. If I recall correctly this could lead to short-stroking problems due to mis-alignment with the gas port. Colt hasn’t returned calls so far. I assume I need to get it to a gunsmith to get this problem fixed? Could someone like ADCO do it?

sjc3081 · February 9, 2009, 10:08pm

I’d sell that rifle to Bushmaster/DPMS for 100 grand. They would love to use that rifle to boost their rep.

Sttrongbow · February 9, 2009, 10:09pm

LOL… man… I must be the unluckiest guy the universe. I gotta be banking Karma on this one…

Jay_Cunningham · February 9, 2009, 10:10pm

All mfgrs. will occasionally put out a lemon. ADCO could easily fix this, if it is truly just a simple canted FSB. Can you post a pic?

C4IGrant · February 9, 2009, 10:12pm

Question, how may windage clicks is it to zero the weapon?

C4

Sttrongbow · February 9, 2009, 10:23pm

I lost count! It’s about 3 clicks from full right adjustment on the ARMS 40L BUIS. Once I ID’d the problem, the cant is visible. I’ll post pics this evening.

Paulinski · February 9, 2009, 10:33pm

If it takes more than 11 clicks in each direction to zero the weapon then its out of spec.

PRGGodfather · February 9, 2009, 10:44pm

As my good friend Andy Faircloth is fond of saying, “There are Monday guns, Wednesday guns and Friday guns. You have to figure out which day you got.”

novfan99 · February 9, 2009, 11:50pm

lol!! good quote

scottryan · February 10, 2009, 12:00am

The gun needs to go back to the manufacturer.

C4IGrant · February 10, 2009, 12:05am

3 clicks from the side or 3 clicks from the center.

Per the TDP you can be 22 clicks from center & be in spec.

C4

bkb0000 · February 10, 2009, 12:08am

i’m not willing to fuck up my zeros, or i’d just find out myself- how far IS 22 clicks? 5/32nds? 3/16ths?

Sttrongbow · February 10, 2009, 12:50am

OK, I counted (I have it co-witnessed with the RDS. It’s 31 clicks to the right.

Sttrongbow · February 10, 2009, 1:03am

Here’s some pics. The forearm rails are DD Omega 7.0’s, but they are very well aligned to the flat top, so they are a reasonable reference.

Jay_Cunningham · February 10, 2009, 1:14am

You said “brand new” - is this literally a NIB from-the-factory LE6920?

sjc3081 · February 10, 2009, 1:18am

Does Colt ship 6920 with rails.

Heavy_Metal · February 10, 2009, 1:54am

Is the sight canted or is the rail canted?

Sttrongbow · February 10, 2009, 2:31am

I bought the upper and lower separately. Both were new when I got them. It’s possible the upper was used, I suppose, but it shows no sign of wear. The upper is all colt marked (barrel and upper), so I don’t think I got taken on a “parts” gun. The gun fired reliably on zeroing using XM193.

Sttrongbow · February 10, 2009, 2:32am

The upper came with M4 handguards. I added the rails. (DD Omega 7.0’s, so no need to remove FSB)

Sttrongbow · February 10, 2009, 2:35am

I checked that carefully. The railed forearm is aligned with the flattop receiver. If I rotate the rails sufficiently to align with teh FSB, the mis-match with the upper is obvious. Further, the cant is discernable just looking through the glass of the EOtech. I tried taking a photo of that, but it didn’t come out. These are the sort of things I’m looking for I guess… I want to be sure I have a problem before sending the upper off to get fixed.