Putting a much larger barrel/ect onto a compact gun really defeats the purpose of it, I'd know. :wink:
Anywho, all you'll need is an outter barrel that is 14mm - threaded. (It will screw directly into place where your flashhider currently is.)
Then you can pair it with whatever size inner barrel you like.
Also, make sure to pair it with a proper cylinder. The Sig 552's cylinder is designed for barrels around 247mm's.
Whatever length inner barrel you choose to install, pair it with the cylinder from the gun its intended to be used with.
Hope that helps. If you have any further questions/ect feel free to private message me and I'll help ya out.
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