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“Solo 300” (300 BLK)

Thread in 'Firearms Chat' started by Hijo202, Sep 23, 2019.

  1. Hijo202

    Hijo202 ODT Junkie!

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    I saw on AR15 (there is a YouTube vid of it also) of a guy that thought of & built a “Solo 300” as he calls it. A manual operated (not DI or piston) AR pistol. Well, I had Lincoln Logs and Lego’s growing up, so as AR’s are like Lego’s, I decided to build one out of all the parts I had laying in my parts bins.

    Following how he built his, I minimized the parts and made it as light as I could. The upper is an American Tactical poly upper that I milled a side charging slot on the left side (I am a right handed shooter), modified BCG (the carrier was cut down to remove the length and weight and tapped the left side for a threaded side charging handle), barrel and barrel nut...only. No gas tube or gas block. The lower is an Anderson with the LPK (except the bolt hold open), and a receiver extension block off that has a pic rail for the attached SB Tactical FS1913 brace (that is easily removable). I have not weighed this yet, but, shooting it one handed isn’t a problem. With my can on it, one handed is doable, but, accuracy definitely suffers.

    The only part that cannot be re-used is the bolt carrier. The rest of the build can be re-configured/completed into a DI system if desired with the additional parts required. It is VERY VERY quiet (just like a 300 BLK bolt action is) as there is no cycling action noise and no percussion escaping out the ejection port, when shooting subs. The optic is a Bushnell Fast Fire III that I have zero’d at 75 yards.

    Yeah, some will say it’s a waste or not what an AR was designed for, but, again, all parts were “extras” for future builds when desired. Here are the pics of the build:
     

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    avmtdan and cmshoot like this.
  2. CBH13

    CBH13 The Hen that laid the Golden Legos

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    i dig it. i bet its fun as hell to shoot
     
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  3. Hijo202

    Hijo202 ODT Junkie!

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    Yeah it is...it was/is a fun project
     
  4. TacticalJeebus

    TacticalJeebus Yes, it’s Jesus with an AR15. Supporter

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  5. redtail

    redtail ODT Junkie!

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    How much gas comes out of the gas port in the barrel? Would be cool to see low light slow motion video.
     
  6. Hijo202

    Hijo202 ODT Junkie!

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    The gas port was tapped (not into the lands/grooves) and a set screw (Locktite) was used to block it off
     
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  7. Burdy

    Burdy ODT Co-Founder

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    I still think it needs a handguard, but other than that, very cool
     
  8. cmshoot

    cmshoot The Hen that laid the Golden Legos Supporter

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    Cool!

    The original Cobb Mfg FA-50 (Fast Action 50) worked the same way. Looked like a big AR with a left-side charging handle. You fired it, then pulled back on the charging handle and let it go......the spring returned the bolt into battery.
     
  9. Hijo202

    Hijo202 ODT Junkie!

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    Yeah, I've been going back and forth about one...just didn't have one short enough in my parts bins (buckets...lol).
     
  10. Hijo202

    Hijo202 ODT Junkie!

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    Didn't know that. Thanks for the info!
     
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