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Q:
Can you modify a SIG 522 to shoot 5.56/.223 ammo? i.e., can you upgrade it to a SIG 556?

Question by dukkillr. Uploaded on February 05, 2010

Answers (7)

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from sgaredneck wrote 4 years 10 weeks ago

I believe that is a .22LR only deal. They would rather you buy the 522 AND the 556. I haven't seen where it has any upper/lower compatibility with the 556. It's also the same story with the S&W M&P 15/22 and the Umarex/Colt M4 .22 clone guns. AR accessories fit but uppers from AR .223/5.56 guns can't be swapped on.

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from K. Oney wrote 4 years 10 weeks ago

no. it is pretty much a whole different layout. if you were to do so, pretty much the only parts lest of the 522 would be the grips, and maybe nt even that. there is such a huge difference between the layout of the 2, i dont think its possible. im not ruling out the possibility of the 556 having a conversin to the 522, but i think it would only work as 556-522, not the other way around. thats a really good question.

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from dukkillr wrote 4 years 10 weeks ago

Thanks for the responses, guys! I'll investigate the 556-522 possibility...I know that you can convert 1911's from 45 ACP to .22LR, which is what got me wondering if you could do the same with rifles in the first place. Thanks again.

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from jamesti wrote 4 years 10 weeks ago

i wouldn't try it. not sure it would be an upgrade dependingon what you want a pistol for.

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from dukkillr wrote 4 years 10 weeks ago

I was just using the pistol as an example, the SIG's are rifles.

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from Zipgun wrote 2 years 35 weeks ago

Well 26 weeks later and sig still has no step down kit like they have for their P250 pistol. In other words a 556 to 22 conversion. Imo do what I did just buy both, a Sig 556 (well in my case a Sig m400 5.56 carbine) and a Sig 522 (swat commando ver)best of both worlds and no fumbling about with a.22 bolt or upper conversion. Not to mention .22 burns way more dirty than a .223 so I'm glad and lucky to own both. As .223 (even with home reloading) is darn expensive these days.

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from Zipgun wrote 2 years 35 weeks ago

Whoops sorry 1 year 26 weeks ago..Haha!

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from sgaredneck wrote 4 years 10 weeks ago

I believe that is a .22LR only deal. They would rather you buy the 522 AND the 556. I haven't seen where it has any upper/lower compatibility with the 556. It's also the same story with the S&W M&P 15/22 and the Umarex/Colt M4 .22 clone guns. AR accessories fit but uppers from AR .223/5.56 guns can't be swapped on.

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from K. Oney wrote 4 years 10 weeks ago

no. it is pretty much a whole different layout. if you were to do so, pretty much the only parts lest of the 522 would be the grips, and maybe nt even that. there is such a huge difference between the layout of the 2, i dont think its possible. im not ruling out the possibility of the 556 having a conversin to the 522, but i think it would only work as 556-522, not the other way around. thats a really good question.

+1 Good Comment? | | Report
from dukkillr wrote 4 years 10 weeks ago

Thanks for the responses, guys! I'll investigate the 556-522 possibility...I know that you can convert 1911's from 45 ACP to .22LR, which is what got me wondering if you could do the same with rifles in the first place. Thanks again.

0 Good Comment? | | Report
from jamesti wrote 4 years 10 weeks ago

i wouldn't try it. not sure it would be an upgrade dependingon what you want a pistol for.

0 Good Comment? | | Report
from dukkillr wrote 4 years 10 weeks ago

I was just using the pistol as an example, the SIG's are rifles.

0 Good Comment? | | Report
from Zipgun wrote 2 years 35 weeks ago

Well 26 weeks later and sig still has no step down kit like they have for their P250 pistol. In other words a 556 to 22 conversion. Imo do what I did just buy both, a Sig 556 (well in my case a Sig m400 5.56 carbine) and a Sig 522 (swat commando ver)best of both worlds and no fumbling about with a.22 bolt or upper conversion. Not to mention .22 burns way more dirty than a .223 so I'm glad and lucky to own both. As .223 (even with home reloading) is darn expensive these days.

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from Zipgun wrote 2 years 35 weeks ago

Whoops sorry 1 year 26 weeks ago..Haha!

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