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Here's a rough attempt at trying to make said p24 HWSS gun a gliderless design (fails at the MWSS to HWSS converter):
x = 99, y = 53, rule = B3/S23
83b2o9b2o$44b2o9b2o27bo9bo$24b2o3b2o14bo9bo27bo11bo$2b2obo2bo15bobobo
2bo12bo11bo26b2o9b2o$o2bob4o17bob2obo12b2o9b2o29b2obob2o$2o24bo2b2ob2o ...

Period-510 glider gun reduced from 43x40 (1720-cell BB) to 42x40 (1680-cell BB) with an even thinner period-3 sparker that reduces the effective height from 7 cells to 6 cells:
x = 40, y = 37, rule = B3/S23
7b2o17bo3bo3b3o$7b2o25bobo$27b3o4b3o$34b3o$6b3o25b3o$6b2obo2b2o13b3o4b
3o$8b2o2b2o20bobo ...

And the above clock-stabilised p10 support can also be hybridised with the original p10 "3G collision" hassler to create a rather-neat alternative 41-cell stabilisation:
x = 13, y = 18, rule = B3/S23
3b2o$4bo$4bobo$5b2o$10bo$8bo3bo$8bo3bo$2b2o5bo2bo$bobo$bobob3o$2obob2o
bo$3bo3bobo$3b2o3bo2$6bo ...

In a somewhat surprising full-circle moment (initially begun with an attempted p92 Pi hassler reduction successfully reducing a p64 glider gun variant), here's an attempted reduction to the p64 glider gun variant successfully reducing a p92 Pi hassler:
x = 64, y = 30, rule = B3/S23
47b2o$40b2o5bobo ...

reduced the above alternative p64 gun design to 43x30 with a custom p4 sparker I had on hand when attempting to reduce an unrelated p92 Pi hassler:
x = 43, y = 28, rule = B3/S23
37b2o$37bo2b2o$31b2o5b2o2bo$30bobo2b3o3b2o$29bo2bobo3bobo$30b3o2bobob
2o$27b3o3bob3o$26bo4bobo$26bob2o4bobobo ...

EDIT: reduction to existing p66 DRL
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Reduction from 209 cells to 187 cells by just simply removing a small amount of catalysts:
x = 59, y = 52, rule = B3/S23
19b2o$20bo$19bo$19b4o$22bo$17b3o$14bobo2bo$14b2ob2o$17bo$17bo$12bob2ob
2o$12b2obo6bo$15bo5b3o$15b2o4b3o2$9b2o17b2o$10bo11bo4bo2bo ...

Here's a rather unique period-98 glider gun design that relies on a newly found p98 honey farm hassler engine by P1GG, converted into a pseudo-p49 gun then period-doubled into a true p98 gun by me:
x = 77, y = 45, rule = B3/S23
57bo2bo$56bo$55bo5bo$55bo4b2o$42b6o8bo$42b4o11bo$18b2o18bo6bobo5bob4o ...

I have attached the knightwise attachment to an additional Sir Robin instead of a Sprayer:
x = 124, y = 77, rule = B3/S23
40bo$38bo2bo$36b2obo3bo$36bo2bo3bo$32b3o2bobo$32bo4bobobo$35bo2bo3bo$
33bobo6bo$34b2o6bo2$36b2ob2o4bob4o11bo$36b2ob2ob2ob3o2b2obob2o4bobo$
36b2o4bo3bobobo6b2o ...

Here's a reduction to the p54 century shuttle, with reductions all throughout:
x = 32, y = 30, rule = B3/S23
7b2o$8bo$2b2o4bob2o17b2o$3bo2b2obobo17b2o$3bobo3bobob2o$2obobo2bo2bobo
2bo$o2bob2obo2bo3b2o12b3o$2bobo7bo11b2o2bob2o$3bo6b2o12b2o2b2o$28b2o3$
7b3o$10bo$2b2o2bo3bo17b2o$2b2o3bo5b2o13b2o ...

Slight additional stator reductions to the p38 gun, specifically to the p2 bookend catalyst and to a stable HF catalyst:
x = 55, y = 31, rule = B3/S23
41bo3b2o$40bobobob3o$21b2o17bobobo4bo$22bo2bo15bobobobobo$19b3o3b3o15b
obob2o4b2o$7b2o9bo3b3o3bo13b2ob3o5bo$8bo2bo6b2obo3b3o12bo3b2o5bobo$5b ...

I have a particularly major problem relating to Golly 1.5 for iPadOS: opening selection boxes at all (for attempting to paste a pattern into Golly, for selecting a pattern in an attempt to copy/clear/random fill (as the attachment demonstrates. In this, I am one tap away from crashing Golly by ...

I also completed the p26 traffic light-phi partial from Entity Valkyrie 2 as a dimer 1 day and 2 hours ago:
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Here's a variant of that mechanism that replaces the second honey farm hassler with a pair of rephased blinkers and a p13 sparker:
x = 36, y = 22, rule = B3/S23
5bo16bo$3b5o14b3o ...

Same base c/6d puffer mechanism, just with a 500-cell population reduction:
x = 520, y = 823, rule = B3/S23
32b2o$30b2o2bo2$29bo$26b4obo$26b3obo$25bobo$24bob2o$23b2o$22b2obo2bo$
22b4obo$20b2o$19b2o$19b2obo$17bob2obo$16b2ob2o$15bo4b2o$15bo3bobo$16bo
3bo$12bo3b3o$11bobo4b4o$10bo3bo3b3ob2o$14bo9bo8b2o ...

p26 queen bee shuttle reduced from 161 cells to 158 cells, achieved by iterating on the relevant p2 catalyst gradually using rlifesrc partials to eventually land on a suitable 73-cell catalyst:
x = 31, y = 21, rule = B3/S23
8b2o11b2o$8bo13bo$10bo9bo$4b2o3b2o9b2o3b2o$4b2o17bo2bo$6b4obo7bob2o$2b ...

Using ElijahKen's redesign proposal for a reduction to gun_19, here's a 112x110 design for gun_19 that doesn't reduce the actual 113x99 design record but still reduces ElijahKen's original 113x112 attempt on this proposal:
x = 112, y = 110, rule = B3/S23
27b2o35b2o$27b2o9b2obo9bob2o9b2o ...

Minpop 90 using a Karel's p15:
x = 28, y = 29, rule = B3/S23
16bobo2bobo$12b2obo2bo2bo2bob2o$b2o13bobo2bobo$2bo$2bobo$3b2o2b2o$7b2o
7bo6bo$14bo2bo4bo2bo$14bo2bo4bo2bo$14bo2bo4bo2bo$16bo6bo3$6b3o$5bo3bo$
4bo5bo$4bo5bo$4bo5bo7b2o$5bo3bo8b2o$6b3o2$2o7bo$2o6bobo$9bobob2o$7bobo
bobobo$7b2obo4bo$10bob3o ...

Reduced engine count of the 13c/246d from 12 engines to just 4 engines:
x = 74, y = 70, rule = B357/S238
29b2o$29b2o$34bo$34bo13b3o$34bo13b2o2b2o$52bo$30b3o3b3o9bo3bo$47bobo$
34bo12bobo$34bo$34bo2$54b2o$16b2o36b2o$16b2o$60b2o$60b2o$68bo$68bobo$
68bobo2$65b2o2b2o$65b2o3bo$66bo2$41b2o$41b2o2$47b2o ...

And a small population reduction from 172 to 167:
x = 34, y = 24, rule = B3/S23
14bo6b2o$6b2o6b3o4b2o6bo$2o3bobo2bo6bo9b3o$o2b3obobobo4b2o8bo$b2o3bobo
2bo14b2o$4bobo4bobo$b2o3bo5b2o9b2o$o2bobobo$2o5bobo11bo$7bo2b2o8bobo$
6bo12b2ob2o5b2o$2o5b3ob2o7bobo4bo2bo$obo6b2o10bo4bob2o$2b3o4bo17bo2b3o ...

It can in fact be done: (33x26 (858-cell BB) p39 gun)
x = 33, y = 26, rule = B3/S23
10b2o6bo2bo2bo$3bo6b2o4b3o2b6o$3b3o9bo11bo3b2o$6bo8b2o4b5ob3o2bo$5b2o
14bo2bobo3b2o$19bobo4bobo$8b2o9b2o5bo3b2o$25bobobo2bo$11bo11bobo5b2o$b
2o7bobo8b2o2bo$o2bo5b2ob2o12bo$b2o2bo4bobo7b2ob3o5b2o$3b2obo4bo10b2o6b
obo ...

p78 glider gun reduced to 37x41 (1517-cell BB) achieved by heavily optimising the p3 catalyst in the previously posted p78 gun design into a much smaller size:
x = 37, y = 41, rule = B3/S23
17b2o5b2o2b2o3b2o$13b2obo2bob2o2bo2bobobobo$14bob2obobob2o5bobo$13bo2b
o2bo3bo5b2o2bo$13b2o3bob2obo6b2obo ...

Period-39 glider gun reduced from 29x40 (1160-cell BB) to 27x40 (1080-cell BB) with a manual stator reduction to a p3 rotor design that was already designed by C_R_116:
x = 27, y = 40, rule = B3/S23
10bo3b2o$9bobobob3o$9bobobo4bo$b2o7bobobobobo$2bo9bobob2o4b2o$2bob2o5b
obo8bo$3bo8bo7bobo$20b2o$7bo ...

EDIT 2 : 7 fewer gliders in the tape and a bit more compression of the ends. p159594, minpop 7291, minbb 20208 x 20236.
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55c/157874d demonoid inspired by this specific design (Period limited by constructing the circuitry, not by construction arm crossover limitations), with a minimum ...

Following up from an optimised Orthogonoid posted by ElijahKen to the Discord server, here's a period-optimised version to period-324520 (Period limited by a block placement for a Syringe rather than any construction arm limitations):
x = 81170, y = 489, rule = B3/S23
80888b2o$80887bobo$80881b2o4bo ...

Reduced period to p227016, still runs perfectly smoothly on 8^4 step:
x = 28929, y = 28735, rule = B3/S23
o$o$o2$7bo$6bobo$6bo2bo$7b2o7$3o12bo$14bobo$14bobo$15bo$10b2o7b2o$9bob
o6bo2bo$9b2o7bo4b3o$15b2o2bo$14bo4bo$12b6o$12b2o$2bo$2bo$2bo17$40b3o$
40bo$41bo23$67bo$66b2o$66bobo21$89b2o$89bobo$89bo9 ...

Slightly more optimised (though period multiplied):
x = 497, y = 553, rule = B2n3-qy4eqy6n7c/S2-n3-a4atz5k6n7e8
217bo$216b2o$216bobo3$191bo2bo$190bob2obo$188b3o4b3o$188bo8bo$188b3o4b
3o48$149bo$149bobo$149b2o18$287bo$286b2o$286bobo23$62bo$61b3o$61bo2bo$
b2o57bo$3o55b2o$o2bo54b2o$b2o57bo$61bo2bo ...