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  1. Apologies for the bullet-point formatting. It seems I can't modify it so each list is single-spaced. If the formatting really bothers you, here's a link to this same document on my google drive: https://docs.google.com/document/d/1U8acwm_xEDo04XfRLj5s-8Zh1z1LMpER9AGWt6l8ONQ/edit?usp=sharing TOKYO MARUI M870: BUILDING THE ULTIMATE AIRSOFT SHOTGUN This is a modification-oriented overview of the Tokyo Marui M870, which has been written over the course of 6 months and covers each phase of my modification and outfitting plan. Treat this writeup as a technical supplement to the more standard reviews already out there, some of which are listed in the Additional Resources section at the end of this document. If you’re short on time, the following is the BLUF (Bottom Line Up Front) for this article: This gun is okay out of the box. Somewhat better than a spring-powered tri-shot shotgun, but not significantly so. See Phase 1 notes for more details. The issues plaguing earlier production runs of this gun have been largely corrected in newer batches. See Phase 2 notes for more details. If you want to maximize reliability and exploit performance potential, get comfortable with taking the gun apart. This especially applies to the x-ring modification, which greatly reduces the likelihood of your gun leaking. See Phase 2 notes for more details. If you plan on upgrading, use WiiTech parts. The more, the better. See Phase 2 and 5 notes for more details. If you want to fine-tune your gun’s performance, converting to HPA is recommended. See Phase 4 notes for more details. If you want to run ammo heavier than 0.30g, be prepared to experiment with the hopup system. See Phase 3 notes for more details. If your gun ends up shooting 0.36+g bbs best, you’ll likely need to upgrade your loading system components. See Phase 5 notes for more details. Fitting a real Remington 870 stock is possible, but it’ll take some work. Having a machinist perform the modification is recommended. See Phase 6 notes for more details. Do not use soft or brittle bbs, like Valken. High-quality bbs like HPA and BLS minimize the likelihood and severity of jams. See the Verdict section for more details. The contents of this article are as follows: Inception/Viability/Selection: Background information Phase 0: Notes gathered from various reviews about TM M870 problems and fixes Phase 1: First impressions and stock performance Phase 2: Disassembly, upgrade and reinforcement part selection, and installation Phase 3: Experimenting with different hopup modifications Phase 4: HPA conversion and performance testing Phase 5: Internal part repair and reinforcement Phase 6: External part selection and fitment, including converting a real Remington 870 stock to fit Phase 7: Accessory and equipment selection On the field/Verdict/What’s next?: After-action report, final modifications, lessons learned, and conclusion Additional Resources/References: Helpful links and sources for information indicated by bracketed numbers The following is the parts list for this build: Base gun: Tokyo Marui M870, wood version Internals Amped Airsoft Integrated Grip Line (IGL) for Jack 1.1/F1/F2, screwed into ¼-28 tapped gas port Blackcat mechanical box spring set WiiTech 150% hammer spring, P/N 4051 WiiTech stainless steel valve pin, P/N 4043 Size 104 nitrile x-ring, modified, installed on valve pin DangerWerx transfer bar WiiTech aluminum loading plates, P/N 4044 WiiTech duster gas nozzle, P/N 4045, with nozzle shaft return spring from WiiTech top gas loading nozzle WiiTech 2016 version hopup chamber, P/N 4059 TM hopup rubbers, shimmed with electrical tape WiiTech 6.03 x 380mm extended inner barrel set, P/N 4032 Externals Real-steel Knoxx SpecOps stock, Gen 1, machined to fit Blackcat sling adapter, slot type, modified to interface with Knoxx SpecOps stock TM M870 Tactical black faux bolt, P/N 870T-39 G&P saddle rail and shell carrier, cut down, P/N MSP-017 Real-steel GG&G QD T1 mount, with Dytac T1 red dot and WiiTech T1 lens protector G&P railed pump, P/N MSP-002H, with Longshot Manufacturing 25-slot M-Lok rails machined to fit Replica H&K vertical foregrip Night Evolution M600C weapon light FMA LA-5 battery box Replica KAC rail covers x2, cut down, backside filed to allow passage of cables WiiTech dummy magazine tube extension, P/N 4028, with coupler from G&P magazine extension Real-steel Remington 870 magazine tube clamp US-issue M60 sling, configured as 3-to-1 point quick adjust sling with ITW MQRB bolted to saddle rail Accessories/other TM shotgun shells with MAS SuperFeed springs and HexMag follower bases Redline SFR regulator First Strike Hero 2 48/4500 HPA tank, or dual First Strike Guerrilla 13/3000 HPA tanks Amped Airsoft HPA line TechT GunSav grease If you’re interested in learning the specifics of how I transformed this rather ordinary replica into what is perhaps the ultimate airsoft shotgun, buckle up. It’s gonna be a long read.
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