NevadaZielmeister Posted May 16, 2023 Report Share Posted May 16, 2023 On 4/21/2023 at 2:07 AM, ardrummer292 said: Does anyone have any information on the new Bullgear hopup unit for these guys? Link: https://bullgear.net/hop-up-lambda-defense-mk48 It seems there's some demand for a replacement hop unit, presumably because the stock cast unit doesn't have great airseal. I'm wondering which air nozzle they're designed for. Highly recommend AGAINST that unit. It would not fit the internal dimensions of the outer barrel/receiver and when I tried to get it to fit, it jammed with BB's, thereby breaking/stripping the gear teeth on the piston. I asked for a refund, still waiting. I would recommend instead the Macaron bucking. with a M120 spring, I was getting 435 FPS with a .20g BB. Quote Link to post Share on other sites
ardrummer292 Posted May 17, 2023 Author Report Share Posted May 17, 2023 On 5/15/2023 at 10:29 PM, NevadaZielmeister said: Highly recommend AGAINST that unit. It would not fit the internal dimensions of the outer barrel/receiver and when I tried to get it to fit, it jammed with BB's, thereby breaking/stripping the gear teeth on the piston. I asked for a refund, still waiting. I would recommend instead the Macaron bucking. with a M120 spring, I was getting 435 FPS with a .20g BB. Well sh*t, I already have it in hand. Was really hoping to use it to improve the airseal, since the stock unit seems a little leaky. I'll fiddle with it to see if I can make it work. Either way, I'll report back with my results. Quote Link to post Share on other sites
ardrummer292 Posted May 26, 2023 Author Report Share Posted May 26, 2023 Quick update: got the Bullgear hop unit installed, plus a Lonex LMG air nozzle. Preliminary results are excellent. These parts, combined with a Prometheus 460mm 6.03 tightbore and purple bucking, yield ~386 +/- 4 fps w/0.30g bbs. This is about 2.09 J, or 475 fps w/0.20g bbs. Results were obtained with the stock M140-ish spring installed. Fair warning, the Bullgear hop unit has a weird clamshell design. It took me a bit of head-scratching to figure out the proper method for installation. 1 Quote Link to post Share on other sites
ardrummer292 Posted August 11, 2023 Author Report Share Posted August 11, 2023 Another update: I'm having good luck with the Lonex LMG air nozzle + Bullgear hopup unit combo. I have installed this setup on a second Lambda Maximi with similar results to those above. I plan on doing the same to a third Maximi, which will be gracing my work bench shortly. 1 Quote Link to post Share on other sites
ardrummer292 Posted December 29, 2023 Author Report Share Posted December 29, 2023 On 9/21/2022 at 9:02 AM, ardrummer292 said: The bipod is… okay. Better than any other airsoft MG bipod (not counting my old Inokatsu Mk43), but still not as sturdy as the real issue item. I imagine it’s easy to install a real bipod, or at least as easy as doing so on a CA/A&K M249. I spoke a little too soon on this topic. One of the Maximis owned by a friend fractured the stock bipod. He sourced a real-steel replacement, which wasn't too terribly expensive. Note that the UKSF Maximi uses an older-style standard M249 bipod, not the newer side-folding version or the prohibitively expensive Mk48-specific bipod: https://www.midwestgunworks.com/page/mgwi/prod/49505 I plan on whacking a short section of 1 1/4" OD x 1" ID aluminum tube inside it, which is required to make the real bipod fit. Link to my guide showing the same bipod upgrade process on a CA/A&K M249: Quote Link to post Share on other sites
ardrummer292 Posted June 6 Author Report Share Posted June 6 1 hour ago, KUSH said: It's great to hear about your success with the Lonex LMG air nozzle and Bullgear hopup unit combo! Consistent performance across multiple Lambda Maximis speaks volumes. Looking forward to hearing about your experience with the third one soon! I probably should've popped back in with an update sooner. The third Maximi is running very well, just like the first two. Based on my experience, this air nozzle + hop unit combo is the superior option for consistent airseal and performance. Quote Link to post Share on other sites
alex008 Posted June 8 Report Share Posted June 8 Any ideas where to find the bull gear hop up unit these days ? Quote Link to post Share on other sites
howitzer Posted June 8 Report Share Posted June 8 2 hours ago, alex008 said: Any ideas where to find the bull gear hop up unit these days ? Seems out of stock in the usual spots e.g. Fire-support/Red Wolf etc. If you're willing to order from Bullgear themselves, expect a bit of a wait. Russian sourced equipment is sometimes coming in a more circuitous route these days. Sometimes via UAE or Turkey. Quote Link to post Share on other sites
ardrummer292 Posted June 10 Author Report Share Posted June 10 On 6/8/2024 at 4:20 AM, alex008 said: Any ideas where to find the bull gear hop up unit these days ? I ordered mine direct from Bullgear. As @howitzer said, it took awhile to show up, but it did eventually arrive. About a month from order to delivery, if memory serves. 1 Quote Link to post Share on other sites
alex008 Posted June 10 Report Share Posted June 10 Past year I ordered some spares to Spain directly from Bull gear but they got confiscated in customs. I am now living in the UK , not sure if it worth the risk. Quote Link to post Share on other sites
howitzer Posted July 3 Report Share Posted July 3 On 6/10/2024 at 4:09 PM, alex008 said: Past year I ordered some spares to Spain directly from Bull gear but they got confiscated in customs. I am now living in the UK , not sure if it worth the risk. You could try asking a UK based retailer to order in a specific part for you? Might be worth exploring. Quote Link to post Share on other sites
kernel Posted September 29 Report Share Posted September 29 Spare Outers for MK48 is pretty rare in the USA. You maybe able to fit legacy model barrels to it. Got a picture of the of barrel and mount point? Quote Link to post Share on other sites
ardrummer292 Posted Wednesday at 04:47 PM Author Report Share Posted Wednesday at 04:47 PM Turns out A&K M249 gearboxes are *not* a drop-in fit for these guns, despite the apparent similarities. The forwardmost bolt holes on the left side of the receiver don’t match up. Quote Link to post Share on other sites
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