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TX, USA
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Posted: 9/30/2024 10:31:32 PM EDT
[Last Edit: cnctactical]
so I purchased the MAC 5 and I just checked my bolt gap and it is 0.15mm .0006. its brand new and I have not went to the range with it. I emailed SDS so will see how good their customer service is. just wanted those how purchased the MAC 5 to check your bolt gap. I measured in MM not inches using stahlwille number 20
Edit: I have RMA the MAC 5 for the bolt gap issue. thanks |
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ID, USA
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Posted: 10/1/2024 12:40:05 AM EDT
[#1]
Originally Posted By cnctactical: so I purchased the MAC 5 and I just checked my bolt gap and it is 0.015mm max. its brand new and I have not went to the range with it. I emailed SDS so will see how good their customer service is. just wanted those how purchased the MAC 5 to check your bolt gap. Minimum is 0.10 I’d replace the rollers to bring it up to 0.18-0.20 |
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Posted: 10/1/2024 3:29:09 AM EDT
[Last Edit: drobs]
[#2]
.015 inches is in the range of a good bolt gap according to this video. The range is .010 to .020 inches.
 HK SP5 before your first trip to the range mp5 heckler & koch h&k |
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USA
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Posted: 10/1/2024 6:54:14 AM EDT
[#3]
Leave it as is. It's fine right where it is at 0.015". Only be concerned when and if it ever drops below 0.01".
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Posted: 10/1/2024 7:06:28 AM EDT
[#4]
Originally Posted By cnctactical: so I purchased the MAC 5 and I just checked my bolt gap and it is 0.015mm max. its brand new and I have not went to the range with it. I emailed SDS so will see how good their customer service is. just wanted those how purchased the MAC 5 to check your bolt gap. .015mm? or .015" because there is a LARGE difference... .015" is fairly wide but in tolerance .015mm is 0.0006" doubt you would even get the feeler gage in that gap if it WAS that. The gage would be so thin it would bend easy. |
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Posted: 10/1/2024 7:40:03 AM EDT
[Last Edit: drobs]
[#5]
 Attached FileFYI the top number is in inches. The bottom number is in millimeters (mm).  Attached FileThe thinnest blade on my feeler gauge: .0015in / .038mm  Attached File |
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TX, USA
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Posted: 10/1/2024 8:52:49 AM EDT
[#6]
it was 0.15mm is .0006 any one higher then this would not work
Quote HistoryOriginally Posted By AFSOC: .015mm? or .015" because there is a LARGE difference... .015" is fairly wide but in tolerance .015mm is 0.0006" doubt you would even get the feeler gage in that gap if it WAS that. The gage would be so thin it would bend easy. |
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Posted: 10/1/2024 9:39:29 AM EDT
[Last Edit: drobs]
[#7]
Quote HistoryOriginally Posted By cnctactical: it was 0.15mm is .0006 any one higher then this would not work Quote HistoryOriginally Posted By cnctactical: it was 0.15mm is .0006 any one higher then this would not work Originally Posted By AFSOC: .015mm? or .015" because there is a LARGE difference... .015" is fairly wide but in tolerance .015mm is 0.0006" doubt you would even get the feeler gage in that gap if it WAS that. The gage would be so thin it would bend easy. Test it again for us. The gun and the bolt needs to be clean. You need to pull the charging handle back, release it, and pull the trigger, each time you test the bolt gap. My AP5-P measures .014 in dirty My AP5 measures .015 in dirty Both are suppressor level dirty... |
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TX, USA
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Posted: 10/1/2024 11:38:33 AM EDT
[#8]
my MAC 5 was cleaned prior to checking the bolt gap. I watched couple of videos to make sure I was doing it correctly. still getting same as before.
Quote HistoryOriginally Posted By drobs: Test it again for us. The gun and the bolt needs to be clean. You need to pull the charging handle back, release it, and pull the trigger, each time you test the bolt gap. My AP5-P measures .014 in dirty My AP5 measures .015 in dirty Both are suppressor level dirty... |
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Posted: 10/1/2024 12:22:25 PM EDT
[#9]
Quote HistoryOriginally Posted By cnctactical: it was 0.15mm is .0006 any one higher then this would not work .15mm is .0069 or .007 which is close to the min.... |
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TX, USA
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Posted: 10/1/2024 12:56:11 PM EDT
[#10]
thank you for the information
Quote HistoryOriginally Posted By drobs: https://www.ar15.com/media/mediaFiles/41568/Bolt_Gap_jpg-3337228.JPG FYI the top number is in inches. The bottom number is in millimeters (mm). https://www.ar15.com/media/mediaFiles/41568/feeler_gauge_jpg-3337232.JPG The thinnest blade on my feeler gauge: .0015in / .038mm https://www.ar15.com/media/mediaFiles/41568/feeler_gauge_2_jpg-3337236.JPG |
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TX, USA
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Posted: 10/1/2024 1:02:22 PM EDT
[#11]
I apologize if I am not correct but I thought the min would be 25mm and the max would be 45mm,
Quote HistoryOriginally Posted By AFSOC: .15mm is .0069 or .007 which is close to the min.... |
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TX, USA
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Posted: 10/1/2024 1:06:22 PM EDT
[Last Edit: cnctactical]
[#12]
I was going off MM and not inches.
0.15 mm/ .006 inches is what my bolt gap is currently. Quote HistoryOriginally Posted By drobs: .015 inches is in the range of a good bolt gap according to this video. The range is .010 to .020 inches.  https://www.youtube.com/watch?v=oIBo1eVqvVA |
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USA
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Posted: 10/1/2024 3:16:10 PM EDT
[Last Edit: titan7]
[#13]
0.015” is pretty much perfect gap.
Just for reference I have 11 German HK roller gun. Nine of them are at 0.015”one is 0.016” and the last at 0.017” All of my MKEs (5) are 0.013 to 0.014” All my PTR (4] are 0.015- 0.018. You are GTG. |
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Posted: 10/1/2024 4:13:06 PM EDT
[#14]
Quote HistoryOriginally Posted By titan7: 0.015” is pretty much perfect gap. |
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Posted: 10/1/2024 5:18:13 PM EDT
[#15]
Quote HistoryOriginally Posted By titan7: 0.015” is pretty much perfect gap. Just for reference I have 11 German HK roller gun. Nine of them are at 0.015”one is 0.016” and the last at 0.017” All of my MKEs (5) are 0.013 to 0.014” All my PTR (4] are 0.015- 0.018. You are GTG. Missing the point he is going off MM not inches and .15mm is .0069" he is also REALLY bad with decimals... |
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Posted: 10/1/2024 6:10:00 PM EDT
[#16]
Quote HistoryOriginally Posted By cnctactical: my MAC 5 was cleaned prior to checking the bolt gap. I watched couple of videos to make sure I was doing it correctly. still getting same as before. Quote HistoryOriginally Posted By cnctactical: my MAC 5 was cleaned prior to checking the bolt gap. I watched couple of videos to make sure I was doing it correctly. still getting same as before. Originally Posted By drobs: Test it again for us. The gun and the bolt needs to be clean. You need to pull the charging handle back, release it, and pull the trigger, each time you test the bolt gap. My AP5-P measures .014 in dirty My AP5 measures .015 in dirty Both are suppressor level dirty... Yeah that's not good. It's basically a blow back gun with that dimension. You are measuring the bolt gap with the bolt in the gun? |
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USA
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Posted: 10/1/2024 6:45:59 PM EDT
[#17]
Quote HistoryOriginally Posted By AFSOC: Missing the point he is going off MM not inches and .15mm is .0069" he is also REALLY bad with decimals... Quote HistoryOriginally Posted By AFSOC: Originally Posted By titan7: 0.015” is pretty much perfect gap. Just for reference I have 11 German HK roller gun. Nine of them are at 0.015”one is 0.016” and the last at 0.017” All of my MKEs (5) are 0.013 to 0.014” All my PTR (4] are 0.015- 0.018. You are GTG. Missing the point he is going off MM not inches and .15mm is .0069" he is also REALLY bad with decimals... Missed that, yep, that a straight blowback gun😳 |
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Posted: 10/2/2024 12:29:38 AM EDT
[#18]
Why is the OP spamming every thread with his issue?
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Posted: 10/2/2024 8:07:45 AM EDT
[#19]
Below the min by a bit but I really doubt that is going to give you any issues. I'm just basing that on the fact that I've seen them run fine with 0.005. + size rollers are very cheap and easy to install.
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Posted: 10/2/2024 11:44:44 AM EDT
[#20]
What issue were you having that made you need to check bolt gap? Does the gun not operate properly if the gap is off? Not being a smartass I genuinely want to know.
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TX, USA
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Posted: 10/2/2024 12:31:03 PM EDT
[#21]
it was brand new, I was watching some reviews on it and a FFL/sot stated to check your bolt gap as his was not in spec. so I decided to check mine before I went shooting and this was the out come. its not a big deal just wanted others who purchased the MAC 5 to make sure they check there's as well. I already got a RMA today for the Bolt gap issue and finish issue on the MAC 5.
Quote HistoryOriginally Posted By bw77: What issue were you having that made you need to check bolt gap? Does the gun not operate properly if the gap is off? Not being a smartass I genuinely want to know. |
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FL, USA
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Posted: 10/2/2024 1:15:04 PM EDT
[#22]
I thought everyone checked their bolt gap when their new roller locked gun comes home. With spark plug gap gages sold cheaply at Walmart, or any auto parts store, it’s super easy. In my case, my AP5, & P both measure .014”. GARY
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USA
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Posted: 10/5/2024 9:16:59 AM EDT
[#23]
Quote HistoryOriginally Posted By titan7: Missed that, yep, that a straight blowback gun😳 Quote HistoryOriginally Posted By titan7: Originally Posted By AFSOC: Originally Posted By titan7: 0.015” is pretty much perfect gap. Just for reference I have 11 German HK roller gun. Nine of them are at 0.015”one is 0.016” and the last at 0.017” All of my MKEs (5) are 0.013 to 0.014” All my PTR (4] are 0.015- 0.018. You are GTG. Missing the point he is going off MM not inches and .15mm is .0069" he is also REALLY bad with decimals... Missed that, yep, that a straight blowback gun😳 A smaller bolt gap means that the bolt carrier stays locked longer, so this one is "further away from" a blowback than one with a larger gap. |
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OK, USA
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Posted: 10/8/2024 6:24:11 PM EDT
[#24]
Mine has zero bolt gap too. Gonna give it a cleaning and try again. Using a Pittsburgh inch feeler gauge set
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Posted: 10/18/2024 4:51:03 PM EDT
[Last Edit: lil_Sig]
[#25]
Quote HistoryOriginally Posted By Stahlgewehr762: A smaller bolt gap means that the bolt carrier stays locked longer, so this one is "further away from" a blowback than one with a larger gap. Quote HistoryOriginally Posted By Stahlgewehr762: Originally Posted By titan7: Originally Posted By AFSOC: Originally Posted By titan7: 0.015” is pretty much perfect gap. Just for reference I have 11 German HK roller gun. Nine of them are at 0.015”one is 0.016” and the last at 0.017” All of my MKEs (5) are 0.013 to 0.014” All my PTR (4] are 0.015- 0.018. You are GTG. Missing the point he is going off MM not inches and .15mm is .0069" he is also REALLY bad with decimals... Missed that, yep, that a straight blowback gun😳 A smaller bolt gap means that the bolt carrier stays locked longer, so this one is "further away from" a blowback than one with a larger gap. I know it seems backwards but. Titan has it right. Go to 6:15  Teufelshund Tactical Heckler and Koch Bolt Gap Review |
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Posted: 10/18/2024 6:49:56 PM EDT
[#26]
This is what fit in my bolt gap. New, unfired.
Plan on running it suppressed this weekend.  Attached File |
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