

IMA also sells an assault pack / bandolier for holding mags. I bought one, never used it.
http://www.ima-usa.com/british-sterling-smg-sas-special-air-service-assault-pack-and-bandolier.html
Did yours come with laces and instructions? If so what laces (number and size) and any chance I can get a copy of the instructions? Mine didn't come with anything (got it from another source when IMA didn't have any) and I haven't found any configuration that is decent.

Congratulations! I enjoy shooting my Mk4 & Mk5. Both are like yours, DLO tubes built by John Andrewski.
Are you having him put the scope posts on it?
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These are the good old days. I would buy as many mags as you can afford.
APEX has a good deal on Sterling mags. Ten for $200.
https://apexgunparts.com/product_info.php/cPath/181/products_id/2825
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SG AMMO has good deals on 9mm. I often buy from them.
- S&B 9mm 115g at $239 per thousand
http://www.sgammo.com/product/selli...-sellier-bellot-115-grain-fmj-brass-case-ammo
- GECO 9mm 124g at $225 per thousand
http://www.sgammo.com/product/geco/...4-grain-fmj-brass-case-ammo-geco-made-hungary
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I would buy a spare barrel to set back in case you ever have a squib and ring a barrel
IMA has them for $150.
http://www.ima-usa.com/british-sterling-smg-mk-iv-9mm-barrel.html
I bought an entire parts set, vacuum sealed and set it back in case I ever needed an odd part. APEX has them for $154.
https://apexgunparts.com/product_info.php/cPath/83/products_id/876
IMA has parts sets with a barrel for $350
http://www.ima-usa.com/british-sterling-smg-mk-iv-parts-set-with-barrel-and-magazine.html
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I put a Burris FastFire II mini-red dot sight on mine. It mounts on the rear scope post. But you have to have John add the posts.
http://www.opticsplanet.com/burris-fastfire-iii-red-dot-reflex-sight-w-optional-picatinny-mount.html
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Have fun
RFA