Luke-airsoft19 Posted September 30, 2020 Posted September 30, 2020 Recently brought a new rail system, to replace my old one. Never tried fitting one before and wasn't sure how to do it, there's a slight gap between the top rail on the handguard and the upper receiver, about 1mm maybe 2mm yet I don't feel I can get the barrel nut tighter without damaging something, just wondered if this was normal, or would I be fine trying to get the barrel nut on further?!
Speedbird_666 Posted September 30, 2020 Posted September 30, 2020 I've seen worse on out-of-the-box guns. It's a plastic receiver - I wouldn't torque it down any further. If the rail is solid, with no wobble, then leave it. You can always move the red dot further forward to cover the gap. Is the rail an Aliexpress jobbie? Looks pretty good on there IMO.
Luke-airsoft19 Posted September 30, 2020 Author Posted September 30, 2020 It's solid and doesn't wobble, just really annoying that its so close. It's a nuprol bocca series II I believe, the standard one was just abit short so I wanted something abit longer! 7 minutes ago, Speedbird_666 said: I've seen worse on out-of-the-box guns. It's a plastic receiver - I wouldn't torque it down any further. If the rail is solid, with no wobble, then leave it. You can always move the red dot further forward to cover the gap. Is the rail an Aliexpress jobbie? Looks pretty good on there IMO. It's solid and doesn't wobble, just really annoying that its so close. It's a nuprol bocca series II I believe, the standard one was just abit short so I wanted something abit longer!
Speedbird_666 Posted September 30, 2020 Posted September 30, 2020 If you haven't already, grease the receiver threads before screwing the nut on. You may be able to get another quarter-turn or so to close the gap slightly. Makes removal easier too. But be really frigging careful. Personally, I would run it as-is. No one, except you, will ever really notice it in the safe zone.
Luke-airsoft19 Posted September 30, 2020 Author Posted September 30, 2020 5 minutes ago, Speedbird_666 said: If you haven't already, grease the receiver threads before screwing the nut on. You may be able to get another quarter-turn or so to close the gap slightly. Makes removal easier too. But be really frigging careful. Personally, I would run it as-is. No one, except you, will ever really notice it in the safe zone. Is there any particular grease you'd use or just standard run of the mill? It's pretty tight as is so maybe just leaving it as is would be best, you can only notice up close anyway! Thanks for the advice... Really appreciate it ?
Nick G Posted September 30, 2020 Posted September 30, 2020 25 minutes ago, Luke-airsoft19 said: It's solid and doesn't wobble, just really annoying that its so close. It's a nuprol bocca series II I believe, the standard one was just abit short so I wanted something abit longer! It's solid and doesn't wobble, just really annoying that its so close. It's a nuprol bocca series II I believe, the standard one was just abit short so I wanted something abit longer! in that picture it looks like the rail is tight against the receiver at the top, if so you wont get the fit lower down any tighter without modding the top section
Luke-airsoft19 Posted September 30, 2020 Author Posted September 30, 2020 2 minutes ago, Nick G said: in that picture it looks like the rail is tight against the receiver at the top, if so you wont get the fit lower down any tighter without modding the top section It's the shadow from the lighting the top is just a fraction off maybe 1mm or 2mm,but I did forget to grease it.
Skara Posted October 1, 2020 Posted October 1, 2020 The receiver is polymer, but the threaded portion is made of metal and I believe you can replace it, although you'll need to salvage the part from another upper, as nobody seems to be selling spares. It ends up being cheaper to replace the whole upper. I wouldn't worry about it too much to be fair, it looks like it's a G&G thing, my ARP-9 has an Ares M-Lok rail and there's a gap too (but it's much wider than yours, like 2-3mm at least). Also, it appears that Nuprol rails are of a much higher quality than Ares ones.
ak2m4 Posted October 1, 2020 Posted October 1, 2020 this is an age old problem with most aftermarket rails sadly, some rails fix this problem by allowing the rail to move up and down the barrel nut and then clamp/screw at the desired point.
axerite Posted October 1, 2020 Posted October 1, 2020 I had this issue when installing a DD rail on a G&P SAI receiver, the solution for me was to send the parts off to Future Tech who I believe shortened the thread on the receiver to allow the rail to butt right up
Speedbird_666 Posted October 2, 2020 Posted October 2, 2020 @axerite If it helps, here is a picture of the brand new Daniel Defense Mk18 AEGs just released by Specna...
Luke-airsoft19 Posted October 4, 2020 Author Posted October 4, 2020 On 02/10/2020 at 20:51, Speedbird_666 said: @axerite If it helps, here is a picture of the brand new Daniel Defense Mk18 AEGs just released by Specna... ??
Speedbird_666 Posted October 4, 2020 Posted October 4, 2020 Actually, even the real steel Daniel Defense Mk18 has a 1-2mm gap:
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