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Posted: 9/10/2014 4:41:23 PM EDT
Does the 516 use the same bolt as the 556xi?

I am assuming the pistons are different, is this correct?

(My 516 is in NFA jail, I was just curious...)
Link Posted: 9/10/2014 6:31:53 PM EDT
[#1]
Quoted:
Does the 516 use the same bolt as the 556xi?

I am assuming the pistons are different, is this correct?

(My 516 is in NFA jail, I was just curious...)
View Quote


No.  The 516 uses an AR type multi-lug bolt while the 556xi uses an AK style bolt with two big lugs.  The 556xi has some compatibility with the 556, but the 516 is completely different.
Link Posted: 9/11/2014 9:58:00 AM EDT
[#2]
Not unexpected but good to know...
Link Posted: 9/12/2014 4:03:51 PM EDT
[#3]
If I had to guess I'd put the parts compatibility between the 556XI and 516 at:


  1. Magazines

  2. Muzzle Devices

  3. Rail Mounted Accessories

Link Posted: 9/12/2014 11:06:08 PM EDT
[#4]
Quoted:
Does the 516 use the same bolt as the 556xi?

I am assuming the pistons are different, is this correct?

(My 516 is in NFA jail, I was just curious...)
View Quote


The 516 is an AR type rifle, and the 556 is a Sig 550 type rifle.
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