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07-30-2018, 09:18 PM
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Convertability of MP15 Sport
Anyone convert an MP15 Sport to 7.62x39? I was curious if there were any caveats involved. I’ve never played Legos with my Sport, but since I have a bunch of 7.62 ammo I figured if it’s easy, why not?
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07-30-2018, 10:57 PM
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Can it be done, simple answer is probably. All depends on whether the mags would fit. Best way to do it would be going with a complete upper. However, then you're getting close to the price of an AK or SKS.
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07-30-2018, 11:21 PM
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Yes, it can be done. You need different mags and a different upper. Simple, but as Westie1 said, it's close to the price of another rifle.
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07-31-2018, 07:57 AM
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An online store has complete uppers for less than $400, I haven't seen an AK that cheap in years, unless I'm looking in the wrong places.
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07-31-2018, 08:13 AM
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I bought a custom 7.62x39 upper off the big auction site for about $400.
Ar uppers in this cal are known to have some feeding issues due to ammo shape. Soft nosed bullets can be problematic too. After some research online, I also purchased ASC mags as they are reported to be the most reliable.
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07-31-2018, 08:57 AM
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Due to the feed issues caused by the distinct taper of the 7.62x39 case I would suggest you look into doing a 300 Blackout instead. While the 300 BLK loses between 100 and 200 fps when compared to the 7.62 x 39 it's a real sweetheart of a round to reload and you can use standard AR magazines without any issues with jamming.
BTW, I have a 16 inch 300 BLK I built myself with a Wilson Combat barrel featuring a pistol length gas system. To allow me to tune the gas system for whatever ammo I am using I installed a Syrac Ordinance adjustable gas block. Doing this allows me to dial back the gas supply to keep the rifle from being over gassed with supersonic ammo and a secondary benefit of this capability is that it's so clean shooting you have to actually see it to believe it. With 100 rounds downrange I can pull the Nickel Boron plated Bolt Carrier and it looks like no more than 5 rounds have been fired. I will also note that the most accurate powder for my rifle has been H110 and it will consistently put 5 rounds in 3/4 inch at 100 yards with either a 125 gr Nosler ballistic tip or Hornady HP.
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